Nodejs Array Flatten flatten(prevous)

Method Source Code

Array.prototype.flatten = function(prevous) {
   var flattenedArr = prevous || [];

   for (var i = 0; i < this.length; i++) {
      if(Array.isArray(this[i])) {
         this[i].flatten(flattenedArr);//from w w  w  .j av  a2  s . co  m
      } else if(this[i] === null) {
      } else {
         flattenedArr.push(this[i]);
      }
   }

   return flattenedArr;
}

Related

1. 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); 
   

2. flatten()

   var arrays = [[1, 2, 3], [4, 5], [6]];
   console.log(arrays.reduce(function(a, b){
     return a.concat(b);
   }));
   Array.prototype.flatten = function(){
     return this.reduce(function(a, b){
       if(!Array.prototype.isPrototypeOf(a))
         a = [a];
       else
   ...
   

3. flatten(array)

   Array.prototype.flatten = function(array) {
     return this.reduce((prev, next) => prev.concat(next), []);
   };
   

4. flatten(func)

   Array.prototype.flatten = function (func) {
     var result = [];
     forEach(this, function (element) {
       forEach(func(element), function (child) {
         result.push(child);
       });
     });
     return result;  
   

5. flatten(nil)

   Array.prototype.flatten = function(nil){
       result = new Array();
       for(var i = 0; i < this.length; i++){
     item = this[i];
     if($.isArray(item)) for(var j = 0; j < item.length; j++) result.push(item[j]);
     else result.push(item);
       return result;
   };
   ...
   

6. flattenArray()

   function flattenArray(a, b) {
     return a.concat(b);
   Array.prototype.flattenArray = function() {
     return this.reduce(flattenArray);
   var arrays = [[1, 2, 3], [4, 5], [6]];
   console.log(arrays.flattenArray());
   

7. flattenArray()

   Array.prototype.flattenArray = function() {
     var flatArray = arrays.reduce(function(a, b) {
     return a.concat(b);
   }, []);
   console.log(flatArray);
   return "";
   var arrays = [[1, 2, 3], [4, 5], [6]];
   console.log(arrays.flattenArray())
   ...
   

8. flattenArray()

   Array.prototype.flattenArray = function()
     var rescultArray=[];
       this.reduce(function(pre, cur,index) 
         rescultArray=index==1?rescultArray.concat(pre,cur):rescultArray.concat(cur);
        });
      return rescultArray;
   var arrays = [[1, 2, 3], [4, 5], [6]];  
   console.log(arrays.flattenArray());
   

9. flattenArray()

   Array.prototype.flattenArray =  function (){
     var array = this.reduce(function(a, b) {return a.concat(b);}, []);
     return array;
   var arrays = [[2, 3, 4], [1, 2], [2]];
   console.log( arrays.flattenArray() );