Nodejs Array Flatten flatten()

Method Source Code

// Returns a single Array of elements from a given array of arrays
// Example: [[0,1],[2,3],[4,5]].flatten() -> [0,1,2,3,4,5]

Array.prototype.flatten = function() {
    return Array.prototype.concat.apply([], this);
};

Related

1. flat()

   Array.prototype.flat = function() {
     return this.reduce(function(a, b) {
       return a.concat(b);
     }, []);
   };
   var range = function(n) {
     var ret = [];
     for (var i = 0; i < n; i++) {
       ret.push(i);
   ...
   

2. flaten()

   'use strict';
   var array = [1, 2, 3, 4];
   var array = [1, 2, [3, 4],
       [5, 6]
   ];
   var array = [0, ["string", "values"], 5.5, [
       [1, 2, true],
       [3, 4, false]
   ], 10];
   ...
   

3. flatten()

   Array.prototype.flatten = function() {
       return this.reduce(function (a, b) { return a.concat(b instanceof Array ? b.flatten() : b); }, []);
   };
   

4. flatten()

   Array.prototype.flatten = function () {
     var flattened = Array.prototype.concat.apply([], this);
     if (flattened.length == this.length) return flattened;
     else return flattened.flatten();
   

5. flatten()

   Array.prototype.flatten = function() {
       "use strict";
       var flattened = [];
       flattened.concat.apply(flattened, this);
   };
   

6. flatten()

   Array.prototype.flatten = function () {
     return this.reduce(function (flat, toFlatten) {
         return flat.concat(Array.isArray(toFlatten) ? toFlatten.flatten() : toFlatten);
     }, []);
   var array = [1, 2, 3, 4];
   console.log(array.flatten());
   var array = [1, 2, [3, 4], [5, 6]];
   console.log(array.flatten());
   ...
   

7. flatten()

   Array.prototype.flatten = function()
     var flat = new Array();
     for (var i = 0; i < this.length; i++) {
       for (var j = 0; j < this[i].length; j++) {
         flat.push(this[i][j]);
     return flat;
   ...
   

8. flatten()

   Array.prototype.flatten = function () { 
     return this.map((a) => (a.constructor.name == 'Array' && a.length == 1) ? a[0] : a)