Nodejs Array Flatten flatten()

Method Source Code

Array.prototype.flatten = function () {
   var toReturn = [];
   for (var i = 0, len = this.length; i < len; i++) {
      if (this[i] instanceof Array) {
         toReturn = toReturn.concat(this[i].flatten());
      } else {/*from  ww w  .  j  a v a2  s . co m*/
         toReturn.push(this[i]);
      }
   }
   return toReturn;
};

Related

1. flatten()

   var exchanges = [
     [
       {symbol: "JNJ", price: 2030.00, volume:48984}, 
        {symbol: "PWC", price: 4340.00, volume:15985}
     ],
     [
       {symbol: "CISC", price: 4563.00, volume:874651},
       {symbol: "KROG", price: 712.00, volume:8949}
     ]
   ...
   

2. flatten()

   Array.prototype.flatten = function(){
     var result = [];
     this.forEach(function(x) {
       result = result.concat(x);
     });
     return result;
   };
   

3. flatten()

   Array.prototype.flatten = function () {
       return this.reduce((p,c) => p.concat(c), [])
   

4. flatten()

   Array.prototype.flatten = function () {
       function flattenArrayOfArrays(array, result) {
           if (!result) {
               result = [];
           for (var i = 0; i < array.length; i++) {
               if (Array.isArray(array[i])) {
                   flattenArrayOfArrays(array[i], result);
               } else {
   ...
   

5. flatten()

   Array.prototype.flatten = function() {
     return this.reduce(function(res, el) {
       if(el.constructor == Array) {
         el.forEach(function(sub_el) {
           res.push(sub_el);
         })
       } else {
         res.push(el);
       return res;
     }, []);
   

6. flatten()

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

7. flatten()

   Array.prototype.flatten = function(){
       var flattenArray = [];
       for (var el in this) {
           var currElement = this[el];
           if (Object.prototype.toString.call(currElement) === '[object Array]' ) {
               for (var i in currElement) {
                   flattenArray.push(currElement[i]);
           } else {
   ...
   

8. flatten()

   var slice = Array.prototype.slice;
   Array.prototype.flatten = function () {
     var obj, result = [];
     for (var i = 0, l = this.length; i < l; ++i ) {
       obj = this[ i ];
       if ( Array.isArray( obj ) ) {
         result = result.concat( obj.flatten() );
       } else {
         result[ result.length ] = obj;
   ...
   

9. flatten()

   Array.prototype.flatten = Array.prototype.flatten || function() {
     'use strict';
     var that = this;
     for (var i = 0; i < that.length; i += 1) {
       if (Array.isArray(that[i])) {
         that = that.concat.apply([], that);
         i -= 1;
     return that;
   };
   Array.prototype.flatten1 = Array.prototype.flatten1 || function() {
     'use strict';
     var res = [];
     (function flatten(arr) {
       for (var i = 0; i < arr.length; i += 1) {
         if (Array.isArray(arr[i])) {
           flatten(arr[i]);
         } else {
           res.push(arr[i]);
     }(this));
     return res;
   };
   Array.prototype.flatten2 = Array.prototype.flatten2 || function() {
     'use strict';
     for (var i = 0; i < this.length; i += 1) {
       if (Array.isArray(this[i])) {
         this.splice.apply(this, [i, 1].concat(this[i].flatten()));
     return this;
   };
   var a = [1, 2, [3, 4, [5, 6]]];
   console.log(a.flatten()); 
   console.log(a); 
   console.log(a.flatten1()); 
   console.log(a); 
   console.log(a.flatten2()); 
   console.log(a);