Nodejs Array Flatten flatten()

Method Source Code

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);/*ww  w .  j  a  v a 2s.  co  m*/
         } else {
            resultArr.push(value);
         }
      }
   }

   getArrays(this);
   return resultArr;
}

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. flatten()

   function flatten (arrays, call) {
     call = call + 1 || 0;
     if(arrays.length === 0 && !call) return null;
     return arrays.reduce(function(flat, cur){
       if(!Array.isArray(cur)) return flat.concat(cur);
       return flat.concat(flatten(cur, call));
     }, []);
   Array.prototype.flatten = function(){
   ...
   

2. flatten()

   Array.prototype.flatten = function() {
       var newArray = [];
       function extractValues( arr ) {
           for (var i = 0, len = arr.length; i < len; i++) {
               var val = arr[ i ];
               if (val instanceof Array) {
                   extractValues( val );
               } else {
                   newArray.push( val );
   ...
   

3. 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 {
   ...
   

4. 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);
   ...
   

5. flatten()

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

6. 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));
   

7. flatten()

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

8. 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());
   

9. 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());