Nodejs Array Flatten flattenArray()

Method Source Code

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());/*from  w  w  w. j  a  v  a 2 s. com*/

Related

1. 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
   ...
   

2. flatten(array)

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

3. flatten(func)

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

4. 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;
   };
   ...
   

5. flatten(prevous)

   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);
       } else if(this[i] === null) {
       } else {
         flattenedArr.push(this[i]);
     return flattenedArr;
   

6. 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())
   ...
   

7. 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());
   

8. 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() );
   

9. flattenArray()

   var arrays = [[1, 2, 3], [4, 5], [6]];
   Array.prototype.flattenArray = function() 
         arrays.reduce(function(previousValue, currentValue, index, array) 
           console.log(previousValue+"---"+currentValue);
           return previousValue.concat(previousValue);
         });
   console.log(arrays.flattenArray);