Nodejs Array Flatten flatten()

Method Source Code

Array.prototype.flatten = function () {
   return this.reduce(function (flat, toFlatten) {
       return flat.concat(Array.isArray(toFlatten) ? toFlatten.flatten() : toFlatten);
   }, []);/*from  ww  w.  j  a v a  2s .  c om*/
}

var array = [1, 2, 3, 4];
console.log(array.flatten());

var array = [1, 2, [3, 4], [5, 6]];
console.log(array.flatten());
console.log(array); // Not changed

var array = [0, ["string", "values"], 5.5, [[1, 2, true], [3, 4, false]], 10];
console.log(array.flatten());

Related

1. 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];
   ...
   

2. flatten()

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

3. flatten()

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

4. flatten()

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

5. flatten()

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

6. 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;
   ...
   

7. flatten()

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

8. flatten()

   Array.prototype.flatten = function () {
       var flattenedArray = [];
       function copyArray(arr) {
           for (var i = 0; i < arr.length; i += 1) {
               if (arr[i] instanceof Array) {
                   copyArray(arr[i]);
               } else {
                   flattenedArray.push(arr[i]);
       copyArray(this);
       return flattenedArray;
   };
   var arr1 = [1, 2, [3, 4], 5];
   console.log('Original:');
   console.log(arr1);
   console.log();
   console.log('Flattened:');
   console.log(arr1.flatten());
   

9. flatten()

   var outputArray = [];
   Array.prototype.flatten = function (){
       function getValues(array){
           var i;
           for (i = 0; i < array.length; i += 1){
               var value = array[i];
               if (Array.isArray(value)){
                   getValues(value);
               else{
                   outputArray.push(value);
       getValues(this);
       return outputArray;
   var array = [0, ["string", "values"], 5.5, [[1, 2, true], [3, 4, false]], 10];
   console.log(array.flatten());