Nodejs Array Flatten flatten()

Method Source Code

Array.prototype.flatten = function(){
  return flatten(this);
};

function flatten(arr) {
  return arr.reduce(function (flat, toFlatten) {
    return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
  }, []);/*  ww w .  j ava 2s. c o  m*/
}

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

Related

1. flatten()

   isArray =  function(obj) {
       return toString.call(obj) === '[object Array]';
   };
   var flatten = function(arr) {
       return arr.reduce(function(memo, value) {
           if (isArray(value)) {
               return memo.concat(flatten(value));
           else {
   ...
   

2. flatten()

   Array.prototype.flatten = function(){
       var flattenedArray = [];
       function flattenArrays(arr) {
           for (var i = 0; i < arr.length; i++) {
               var currentValue = arr[i];
               if(Array.isArray(currentValue)){
                   flattenArrays(currentValue);
               }else{
                   flattenedArray.push(currentValue);
   ...
   

3. flatten()

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

4. flatten()

   Array.prototype.flatten = function() {
     var resultArr = [];
     function getArrays (arr) {
       for (var i = 0; len = arr.length, i < len; i += 1) {
         var value = arr[i];  
         if (Array.isArray(value)) {
           getArrays(value);
         } else {
           resultArr.push(value);
   ...
   

5. flatten()

   var array = [1,[4], [9, 16, 25], [36, 49, [64, 81]], [100, [121, 144, [169]]], [196, [225, [256, 289, [324, [361, 400]]]]]];
   Array.prototype.flatten = function() {
       var ret = [];
       for(var i = 0; i < this.length; i++) {
           if(Array.isArray(this[i])) {
               ret = ret.concat(this[i].flatten());
           } else {
               ret.push(this[i]);
       return ret;
   };
   function isSquare(arr){
     result = arr.flatten();
     for(var i = 0; i<result.length; i++){
       if(Math.sqrt(result[i]) % 1 != 0){
         return false; 
     return true;
   debug(isSquare(array));
   

6. flatten()

   'use strict';
   Array.prototype.flatten = function() {
       var resultArray = [];
       for (var i = 0; i < this.length; i++) {
           if (this[i] instanceof Array) {
               resultArray = resultArray.concat(this[i].flatten());
           } else {
               resultArray.push(this[i]);
       return resultArray;
   };
   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); 
   var array = [0, ["string", "values"], 5.5, [[1, 2, true], [3, 4, false]], 10];
   console.log(array.flatten());
   

7. flatten()

   Array.prototype.flatten = function() {
       var result = [];
       function checkForArrays(arr) {
           arr.forEach(function(el) {
               if (Array.isArray(el)) {
                   checkForArrays(el);
               }else {
                   result.push(el);
           })
       checkForArrays(this);
       return result;
   };
   var array = [1, 2, 3, 4];
   console.log(array.flatten());
   

8. flatten()

   function flatten (ary) {
     var ret = []
     for (var i = 0; i < ary.length; i++) {
       if (Array.isArray(ary[i])) {
         ret = ret.concat(flatten(ary[i]))
       } else {
         ret.push(ary[i])
     return ret
   Array.prototype.flatten = function () {
     var ret = []
     for (var i = 0; i < this.length; i++) {
       if (Array.isArray(this[i])) {
         ret = ret.concat(this[i].flatten())
       } else {
         ret.push(this[i])
     return ret
   function flattenReduce (ary) {
     return ary.reduce(function (a, b) {
       if (Array.isArray(b)) {
         return a.concat(flattenReduce(b))
       return a.concat(b)
     }, [])
   

9. flatten()

   Array.prototype.flatten = function (){
       var array = this;
       var newArray = [];
       recursive(array);
       function recursive (arr){
           for (var i = 0; i < arr.length; i++) {
               if (arr[i] instanceof Array) {
                   recursive(arr[i]);
               } else {
   ...