lodash array to tree

Lodash is a JavaScript library that works on the top of underscore.js. But we want to write functional style code and do some transformations on arrays or objects. linkList of Methods. Lodash Documentation lodash.Dictionary JavaScript and Node.js code examples ... Lodash _.isArray() Method - GeeksforGeeks The performance benefits of first and rest are left as an exercise to the reader. It provides us with various inbuilt functions and uses a functional programming approach which that coding in JavaScript easier to understand because instead of writing repetitive functions, tasks can . You are better off using a vanilla for loop than using any of the built-in iterators. Is there a short way to re-assign array that consists of objects into a new one. Lodash is a JavaScript library which provides utility functions for common programming tasks. JavaScript Flatten Deeply Nested Array of Objects Into ... Lodash To find out that if members with age less than or equal to 2 exists in familyTree, we can check the flat array using a method like _.some from lodash. Upgrade to lodash@^3.0.0. In this tutorial, we will learn about how to debounce function invocation in JavaScript. Lodash - Flatten an array to single level deep | code ... Lodash's modular methods are great for: Iterating arrays, objects, & strings. Check how cool is the tool. What is Lodash in angular? - AskingLot.com Flat To Array Tree [DSX9LB] Lodash. To find out that if members with age less than or equal to 2 exists in familyTree, we can check the flat array using a method like _.some from lodash. Here's what the code would look like: [Question] Tree shaking · Issue #50 · evanw/esbuild · GitHub tree-plugin-underscore is an underscore.js extension to build a tree structure form a flat array. Check how cool is the tool Output [2,3,4,5,6,7] [4,5,6,7] Lodash is a JavaScript library that works on the top of underscore.js. The definitive collection of is* functions for runtime type checking. If I have a situation in which I am dealing with many nested levels of arrays I can use the _.flattenDepth method that is just like _.flatten only it accepts a second argument that sets the depth at which flattening is to take. If an object is provided for callback the created ".where" style callback will . 2 - _.forEach(Array,iteratee) vs Array.forEach(iteratee) You can convert Array pairs to Object key-value pairs using Lodash. So a basic example of the lodash chunk method might be like this: 1. Functional JavaScript: Traversing Trees with a Recursive ... Deepcopy of JavaScript Objects and Arrays using lodash's cloneDeep method. The Lodash _.isArray () method checks if the given value can be classified as an Array Value or not. Array: [Required] The Array which you want to convert to 1 Dimensional Array on first level. _.take (array, n) Parameters: This method accept two parameters as mentioned above and described below: array: This parameter holds the query array. I wouldn't recommend this, because it's a hack, but it works On the other hand I still need to know how deep an entry was nested to add the right amount of padding on the left side - so it looks like a tree in the end. It's returning the union of the original array, and the nested children. To check for an element's existence in an array with the some() method, the predicate should make a strict comparison of each element against the specified value. And utility libraries like Ramda or Lodash don't come with . Paths are lodash-compatible. January 12, 2018 January 24, . Plz check it, it's free and I need feedback . Click to see full answer. The lodash _.forEach method is one of the many methods in lodash that is a collection method meaning it will work well with just about any object that is a collection of key value pairs in general, not just keys that are numbered and an instance of the javaScript array constructor. Lodash _.flattenDepth () Method. Syntax: Hey geek! 2. lodash filter array of objects by array of exclude property values. The following code example demonstrates this by finding a person with . Common case of using this is converting a "link" object in a hypermedia response into a hash map of links. The method fromPairs is used to make Object from Array Pairs. The first argument given to the lodash chunk method should be the array that is to be broken down, and the second argument is the number of elements per chunk or child array within the resulting array that is returned. The use of it is also pretty simple I juts call the method and pass the array as the first and only argument and the return value is then the sum. Show activity on this post. This method is like _.findIndex except that it iterates over elements of a collection from right to left. I recently went through our main app looking to reduce the bundle size and quickly identified that we were still getting most of lodash imported despite our best efforts to do specific functional imports. It helps in working with arrays, strings, objects, numbers, etc. Another way is to use node file command . Questions: I am using npm on the debian Linux flavor to install Jpm. Features. Example Demo. Check how cool is the tool In the code snippet, we are flattening an array - arr to level 1 depth and level 2 depth. Questions: I have been trying to restructure the following flat array (participations, see below) to a more organized tree form, so that i can use Tree grid component of syncfusion. 3. So it's necessary to include the 'partial' extension before we load 'tree' extension. Tree traversal library written in Underscore/Lodash fashion. ECMA 2019 introduced a new method called flat () for recursively flatten an array. I have tried using the .reduce() function. Expands selected nodes: tree.selected().expand(); Expands selected nodes and their children: tree.selected . a partially empty array can also be flattened here. Array: [Required] The array that you want to flatten to a fixed depth. example: tree.GetTree () .sort (callback) The custom sort method. Do we really need to import everything? For example. Manipulating & testing values. If a property name is provided for callback the created ".pluck" style callback will return the property value of the given element. Lodash's modular methods are great for: Iterating arrays, objects, & strings. Lodash Arrays. The easiest way to solve it is recursion (link to jsbin). We map several TreeNode methods so you can easily invoke them on all nodes in the collection, or recursively. Pre ES6, lodash was an absolute gem, just like jQuery was back in its day, providing rich cross-browser functionality. Return Value: It returns a curried version of the function. With the array destructuring operation, we assign the created arrays to two variables: nums2 and nums3. Syntax: Hey geek! The following entry added in package.json. This is because the _.chain function takes, as input, a (typically array-like) object and returns, as output, a chain object whose methods correspond to the current chainable methods in lodash . python and bash, can have functions outside of classes. Manipulating & testing values. Using Lodash/Underscore Library. npm install --save lodash. Result generated with Lodash _.orderBy() in Figure 7. TreeNodes is an Array-like object which holds multiple TreeNode objects. While doing so, we realized tree shaking is not something we can simply . To review, open the file in an editor that reveals hidden Unicode characters. Lodash Chain. At Theodo, our aim is to build reliable and fast applications for our customers.Some of our projects include improving the performance of already existing applications. Inflate flattened objects and make them regular JS objects again. practically passing the Object thru a string that will clean up the Object tree from the references nested inside by recreating a new Object with copied properties and values from the original one. This is a reason why we have incorrect comments tree - filtrate object contains mutated paths, so its paths do not correspond with source object anymore. Raw recurssive.tree.js This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. As we all know, lodash-es is built with a more modular syntax for supporting tree shaking by build tools. JS like most scripting languages, e.g. Ask Question Asked 4 years, 7 months ago. The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. Next step is to install lodash in nodejs project using below command. lodash property search in array and in nested child arrays. 1. Lodash is a javascript library for common utility functions. However, chain related features means some functions are attached to a object/prototype chain. Creates an array of values by running each element in collection through iteratee. The some() method returns true if at least one element passes the provided predicate and returns false otherwise. Convert object with 'long.property.name' property to object tree. This information is also needed to close and open . . Using Array.prototype.flat () function. It's returning the union of the original array, and the nested children. tree.node('a-unique-id').select(); TreeNodes. Object for describe flags and field names for tree. As in, more than you would expect. options - optional parameter. . but it seems i cannot make the correct strucutre. Chaining is supported in custom builds as long as the _#value method is directly or indirectly included in the build. The dirty answer is that you can "discover" the nature of the structur. I have referred to few of the following links but am still unable . Lodash is greater than underscore library in terms of functionality and performance. Sample B-tree. or is there a trick in lodash to simplify this. . _.flattenDepth Lodash _.flattenDepth(Array, Depth=1) Argument passed description. Which means: tree-like objects are not allowed. Lodash _.sortBy() Method _.sortBy() is similar to _.orderBy(), both use the Lodash library. Deepdash lib is used in PlanZed.org - awesome cloud mind map app created by the author of deepdash. Syntax: _.flattenDepth (array, depth) Parameters: This method accepts two parameters as mentioned above and described below: array: This parameter holds the array that need to be flatten. Answer (1 of 9): The clean answer is that you know, precisely, the structure of that JSON before you begin to read it. This is one such use-cases where using lodash functions pay off. However, this method generates an array of elements sorted in ascending order (interaction between collection and iterator). I need this to build a tree I am constructing an utility that makes use of tree, treegrid parts primarily based on React. Here, we are using it to de-structure array elements. _.findLastIndex(array, [callback=identity], [thisArg]) source npm package. The performance benefits of first and rest are left as an exercise to the reader. 3 - The lodash _.flattenDepth method for when there are many levels of nested arrays. The easiest way to solve it . The depth value can be specified as infinity to completely flatten the array. I want to use Lodash library and can't figure out how to split it inside and concatenate. Lodash and underscore changed the way I write Javascript forever, but today there might be better options for the most common functions. The first argument given to the lodash chunk method should be the array that is to be broken down, and the second argument is the number of elements per chunk or child array within the resulting array that is returned. const subject = [ ['name', 'Math'], ['score', 90], ['dept', 'Mathematics'] ]; const subject_obj = _.fromPairs(subject); Best JSON Validator, JSON Tree Viewer, JSON Beautifier at same place. 2. The Lodash _.partitionBy () method takes an array and a function and hence generates a partitioned array based on the conditions of the given function. Now to lookup anything we just need to traverse the flat array in time O(n), instead of going deep in the original tree on each lookup, which is expensive. Creating composite functions. Example 1: Javascript. this method reads children property from a node and map with tree data to return an array of children objects. That will . The wrapper String methods are: I can see chain is published with lodash-es, but I am not sure how to use it with proper imports with other chained method.. A usecase may look like this: . (Millions json object in array) by passing specific column. Hot Network Questions 3. Using generator function. The method is fairly easy to use so this should be be quick when it comes to just using the single lodash method. Questions: i having trouble to transform the following array data1 to look like data2:I tried to use lodash but its a bit strange _gropuby gives me an object array. Array: [Required] The input array that contains values that need to be joined together with some seperator.. Seperator: [Optional] The seperator value that will join the array elements.The default value of Seperator is ',' means if you do not pass its value, it will separate the array values with commas. Creating composite functions. npm install lodash-contrib. Flatten objects and arrays so that each key is the full path to a primitive value. 4. The wrapper Array methods are: concat, join, pop, push, shift, sort, splice, and unshift. import { get } from "lodash-es" and webpack is not tree shaking the lodash at all resulting in including full lodash library into my bundle. Lodash _.isArray () Method. Search Index Data (The code snippet can also be found with below search text) The use case is to convert an array of objects into a hash map where one property is the key and the other property is the value. Basically, this is a simple example to return first four elements of a numeric array. This method takes an argument depth, it is an Integer specifying how deep a nested array needs to be flattened. Lodash-compatible, tree-shakable, with types. Using Array.prototype.find () function. To remove first 3 elements from an array pass n value as 3. . Now to lookup anything we just need to traverse the flat array in time O(n), instead of going deep in the original tree on each lookup, which is expensive. 4. each. I'm using Webpack 4.11 so sideEffects flag should be in use, but it's not. During one of these missions, we managed to reduce the bundle size of all our pages by a whopping 500KB Gzipped by tree shaking our internal libraries.. This comment has been . Syntax _.join(Array, Seperator=',') Parameters description. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. cloneDeep function is imported from lodash import * as cloneDeep from 'lodash/cloneDeep'; this.searchString is the string value for the filter text. Using Array.prototype.some() function. 6. This array structure is then flattened using flatten(), so you can find() the item. Learn more about bidirectional Unicode characters . Here, we are using it to de-structure array elements. 4. You can use _.drop method of lodash to remove first n elements from an array. Best JSON Validator, JSON Tree Viewer, JSON Beautifier at same place. Standalone or as a Lodash mixin extension. Below are the code snippets: The filter() function is called on (keyup) of input type="text". By convention, Lodash module is mapped to the underscore character. The iteratee is. condense - condense sparse array; condenseDeep - condense all the . The days of JScript, Trident and Chakra are long gone, let's not continue to use tools from those days, go native! Best JSON Validator, JSON Tree Viewer, JSON Beautifier at same place. The constant emerging technologies in the world of web development always keeps the excitement for this subject through the roof. Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc. Will create a minified 16.5 kb bundle. Syntax: Hey geek! Which also allows multiple sequential arrays (c[0][1].49 = 'foo' and doesn't require the last key to be an object (c[0] = 'foo') . 4. each. It's currently in a branch as I test it and prepare it for release. Note: To execute the below examples, you have to install the lodash-contrib library by using this command prompt and execute the following command. Thank you. This post will discuss how to find a value in an array of objects in JavaScript. $ node col_partition.js [ -5, -1, -6 ] [ 4, 3, 2, 7, 8, 9 ] Lodash collection reduce lodash: this library contains some helpful javascript functions. Object tree traversal in javascript (with lodash) Raw traverse.js This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. callback (a, b) - a and b have IronTree\Node type and have methods: add, remove, get . They pop up all over the place. For instance, Lodash is a bit of a strange case in that tree shaking as it's described in this guide doesn't work. Checks if value is empty. But the way to do it isn't always obvious. It will work with any depth (with recursion limit of course) and it's one of . lodash specifically does this because you can npm install lodash.fileName to only install a specific function if you only need 1, this is to reduce bundle size. lodash array to tree (10) I have a complex json file that I have to handle with javascript to make it hierarchical, in order to later build a tree. Create recursive tree from json using lodash transform without recursion. To flatten any depth of a nested array, use the Infinity with the flat () method. Active 3 years, . Lodash. I have tree shaking basically implemented, and about to be released. The Lodash.flatten () method is used to flatten the array to one level deep. lodash.default.js is bundled although is not imported by filter or its dependencies. Like { id: 5: parent: 1 }. Best JavaScript code snippets using lodash.Dictionary (Showing top 6 results out of 315) Write less, code more. Every entry of the json has : id : a unique id, parentId : the id of the parent node (which is 0 if the node is a root of the tree) level : the level of depth in the tree Last Updated : 29 Jul, 2020. Lodash contains tools to simplify programming with strings, numbers, arrays, functions and objects. n: This parameter holds the number that represents the number of elements to take from array. But am getting errors about the versions of lodash installed (as follows) test@localhost:~# npm install jpm --global npm WARN deprecated lodash@2.4.1: lodash@<3.0.0 is no longer maintained. It takes the depth of the nested array as a parameter, which is 1 by default. JSON Tree Viewer, JSON Beautifier at same place. In case you're using Set as an intermediate data structure for removing duplicate values from the array, the code can be simplified using underscore or lodash JavaScript libraries. You might want to change all the values, or make some calculation on the tree. It is a utility library for manipulating strings, arrays, and collection . utility flatten unflatten js paths. The recommended solution is to use the find () method that returns the first occurrence of an element in the array that satisfies the given predicate. . ### That's a very simple tree traversal task. Webpack reports the reason as "harmony side effect evaluation" If i import functions not used by 'lodash.default.js' to configure chaining like head, tree shaking works fine with a <1kb bundle. Flattening array holes i.e. The _.flatMapDeep() method creates a flattened array of values by running each element in the given collection through the iteratee function and recursively flattens the mapped results. The array will be re-indexed, and values of such condensed array will be placed to the shifted positions with changed indexes. 3. With a little bit of magic and custom chain function, we can tree shake it. Should i be looping inside the array…creating a custom function for this. Only explicit functions import ie. I am able to filter a tree by using simple recursion. And to achieve that I also need all data objects to be on the same level in the array. Can have unlimited nesting. The default value of this parameter is 1. Lodash helps in working with arrays, collection, strings, objects, numbers etc. Lodash is a JavaScript library that works on the top of underscore.js. list - array list with elements. Not all js libs do this though and go for more traditional class based structure. Sometimes when working on a javaScript project there is a need to create a range of numbers in an array, with lodash there is the _.range method than can be used to quickly make a range of numbers. But trees can be tricky. This release is going to be about correctness, not minimal bundle sizes. I have also tried lodash to group them by . If you're like me, you know that there ought to be a way to process them neatly. "dependencies": { "lodash": "^4.17.10" } Create an index.js file with below code. Trees come up a lot in web development. It is . It introduces the tree shaking data structure but doesn't yet handle the side-effect annotations you mention in #86 (comment). For example. That allows you to know where the nested objects/keys are and where the arrays are to loop over them, etc. Download Code. The following example creates a duplicate-free version of an array by using the uniq() method. Thankssss /***** let data1 . Lodash doesn't include all the methods in the core library as underscore does. This method merges all the nested arrays present inside an array. These days, all the browsers treat JavaScript standards fundamentally the same, with very little difference. Check how cool is the tool _.flatten Lodash _.flatten(Array) Parameters description. JavaScript Debounce function invocation. A value is considered empty unless it's an arguments object, array, string. 0.2.13 • Published 5 years ago. In addition to lodash methods, wrappers have Array and String methods. Now at it's lowest price ever! Break an array into chunks; Remove all falsey values from array; . This array structure is then flattened using flatten(), so you can find() the item. Debounce :-The Debounce is a technique to group multiple sequential events calls into one event call. That's a very simple tree traversal task. If lodash is there to work with in a project the lodash sum method can be used to quickly sum up the values of an array though. Lodash-compatible: The provided functions are compatible with lodash's, so they can be used as drop-in replacements.This includes non-obvious things like being able to work with polyfilled builtins, not throwing in old environments where things like Map aren't . Method 1: Using the flat () method in JavaScript. Example 1: You are better off using a vanilla for loop than using any of the built-in iterators. This is one such use-cases where using lodash functions pay off. This library can be used in javascript/jquery applications and npm based applications like angular, react and vueJs frameworks. Use it with lodash. 6. Figure 8. So a basic example of the lodash chunk method might be like this: 1. .GetTree () This method will be return json tree. The _.flattenDepth () method is used to flatten up to depth time that is passed into the function. Return Value: This method returns an array of first n elements. Because of how Lodash is architected, you have to a) install the lodash-es package in lieu of regular old lodash and b) use a slightly different syntax (referred to as "cherry-picking") to shake off the other dependencies: 4. Code: const array_string = [1,2, ,4, 5, , 8]; console.log('flatten by depth infinity:', array_string.flat()); Output: Empty values are found in the above array_string, but the array is flattened and empty arrays are removed from the array_string. Lodash helps in working with arrays, strings, objects, numbers etc. Here, thru() is used to initialize the wrapped value. Is. The given value can be specified as Infinity to completely flatten the array you. ; condenseDeep - condense sparse array ; String methods it helps in working with,!: //origin.geeksforgeeks.org/how-to-deep-flatten-an-array-in-javascript/ '' > how to add lodash in nodejs project using command! ) by passing specific column split it inside and concatenate n elements ; all. Project using below command be quick when it comes to just using the.reduce ( ) for recursively an! Off using a vanilla for loop than using any of the lodash chunk method might be like this 1., not minimal bundle sizes use lodash library '' > lodash/lodash - Gitter < /a > JavaScript Debounce function.... The way to process them neatly it inside and concatenate lodash module is mapped the! Of first n elements the same, with very little difference: 1 } exercise to the reader do transformations. * * * * * * let data1 file command ; t come with lodash & # x27 s... Correct strucutre module is mapped to the reader all falsey values from array ; and make them JS! Style code and do some transformations on arrays or objects > Questions: i am using npm on debian...: //github.com/sinmsinm/tree-plugin-underscore '' > how to split it inside and concatenate Iterating arrays,,. Browsers treat JavaScript standards fundamentally the same, with very little difference original,. It takes the depth of a nested array as a parameter, which is by! Allows you to know where the nested children left as an exercise to the reader make object from array.! Have functions outside of classes based structure false otherwise calls into one event call represents! > JavaScript Debounce function invocation its dependencies which is 1 by default objects, amp... Currently in a branch as i test it and prepare it for.! Recursion ( link to jsbin ) classified as an exercise to the underscore character elements take. By finding a person with following example creates a duplicate-free version of array! That there ought to be about correctness, not minimal bundle sizes a basic example of the following code demonstrates! Imported by filter or its dependencies compiled differently than what appears below be. Like Ramda or lodash don & # x27 ; s a very simple tree traversal task file bidirectional! Unicode text that may be interpreted or compiled differently than what appears below i be looping the! Always keeps the excitement for this subject through the roof ] the array that you want write. ( with recursion limit of course ) and it & # x27 ; like... Standards fundamentally the same, with very little difference, chain related features means some functions attached... Or its dependencies array by using the.reduce ( ) method is fairly easy to node. First n elements pop, push, shift, sort, splice, and unshift modular methods are concat. Like me, you know that there ought to be about correctness, not minimal sizes... A duplicate-free version of an array into chunks ; lodash array to tree all falsey values from array.. Infinity to completely flatten the array to one level deep file contains bidirectional Unicode that... We map several TreeNode methods so you can & quot ; style callback.! Example to return first four elements of a collection from right to left structure is then flattened flatten! Will learn about how to deep flatten an array of elements to take array! The function and their children: tree.selected ( ) is used to flatten to a object/prototype chain uniq ( for. Json tree Viewer, json Beautifier at same place basically, this generates... > GitHub - sinmsinm/tree-plugin-underscore: tree-plugin... < /a > list - array with... Events calls into one event call with elements like me, you know that there to! Wrappers have array and String methods, or make some calculation on the top underscore.js. > Questions: i am using npm on the top of underscore.js is lodash nodejs... Of objects into a new method called flat ( ) method is to... Check how cool is the tool _.flatten lodash _.flatten ( array, use the Infinity with flat... //Gitter.Im/Lodash/Lodash '' > GitHub - sinmsinm/tree-plugin-underscore: tree-plugin... < /a > Another way is to node! Little difference json object in array ) by passing specific column from right to left falsey values from array.. Partially empty array can also be flattened here the nested children them, etc with any depth the... And unshift is an Array-like object which holds multiple TreeNode objects lodash & # x27 s. Better off using a vanilla for loop than using any of the chunk... It is recursion ( link to jsbin ), pop, push shift. In array ) Parameters description recursion limit of course ) and it & # x27 t... Off using a vanilla for loop than using any of the structur, strings, objects numbers!, strings, objects, numbers etc fixed depth or not a way to it! Javascript Debounce function invocation describe flags and field names for tree this by a... To install lodash in nodejs project using below command ) method is in... Consists of objects by array of values by running each element in collection through iteratee of... /a... Have functions outside of classes, join, pop, push, shift, sort splice! Take from array Pairs: //github.com/sinmsinm/tree-plugin-underscore '' > what is lodash in?! Functions and objects to Debounce function invocation sorted in ascending order ( interaction collection! Let data1 passes the provided predicate and returns false otherwise an array in JavaScript nested children that you! Exercise to the reader be quick when it comes to just using the single method... The arrays are to loop over them, etc lodash array to tree like Ramda or lodash don & # ;! False otherwise used to initialize the wrapped value following links but am unable... Calculation on the tree, all the methods in the world of web development always keeps the excitement for.... 1 Dimensional array on first level least one element passes the provided predicate and returns otherwise..., wrappers have array and String methods lodash helps in working with arrays, objects, numbers,,! _.Flattendepth ( ).expand ( ) in figure 7 will be return tree... Array by using the.reduce ( ), so you can easily invoke them on all nodes the... On all nodes in the world of web development always keeps the excitement for this sorted in order... Flattened using flatten ( ) is similar to _.orderBy ( ).sort callback! Code and do some transformations on arrays or objects debian Linux flavor to install lodash nodejs... Initialize the wrapped value though and go for more traditional class based structure ) it. By array of exclude property values thankssss / * * * * * * * * data1... Browsers treat JavaScript standards fundamentally the same, with very little difference map app created by the author deepdash. What is lodash in nodejs with examples as i test it and prepare it for release to time! Inside an array of children objects href= '' https: //www.cloudhadoop.com/2018/08/learn-lodash-in-nodejs-with-examples.html '' > Why using ` _.chain ` a! 1 } reads children property from a node and map with tree data to return first four of! ) in figure 7 the wrapped value the author of deepdash values from.. Questions: i am using npm on the tree lodash array to tree array…creating a custom function for this through... Sequential events calls into one event call > Another way is to install Jpm using a vanilla for loop using... Library for manipulating strings, objects, numbers etc - sinmsinm/tree-plugin-underscore: tree-plugin... < /a > Another is. Keeps the excitement for this this: 1, open the file in an that. Lodash library and can & quot ; the nature of the structur specifying deep. Using npm on the tree ) Argument passed description using below command both the! Where using lodash functions pay off, open the file in an editor that reveals hidden Unicode characters of! Predicate and returns false otherwise ( link to jsbin ) arrays,,... ; condenseDeep - condense all the values, or recursively type checking can easily invoke them on nodes... Tool _.flatten lodash _.flatten ( array ) by passing specific column functions outside of classes the dirty answer that!

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