Javascript Array flattenArray() method

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   ww  w.j  av  a 2s .  com*/

Array.prototype.flattenArray = function() {
 var flatArray = arrays.reduce(function(a, b) {
  return a.concat(b);
}, []);/*from www. j av a  2s .c o  m*/
console.log(flatArray);
return "";
}

var arrays = [[1, 2, 3], [4, 5], [6]];
console.log(arrays.flattenArray())

Array.prototype.flattenArray =  function (){
 var array = this.reduce(function(a, b) {return a.concat(b);}, []);
 return array;/*from www.  j a  v  a 2  s  .  c o  m*/
}


//------------------- Testing -----------------------------------//
var arrays = [[2, 3, 4], [1, 2], [2]];
console.log( arrays.flattenArray() );
//------------------- Testing -----------------------------------//

var arrays = [[1, 2, 3], [4, 5], [6]];
var newArray = [];

Array.prototype.flattenArray = function() {
  newArray = this.reduce(concatArray)//from   ww w  .  j av  a2  s .com
 return newArray;
};

function concatArray(previousValue, currentValue){
 return previousValue.concat(currentValue);
}

console.log(arrays.flattenArray());

Array.prototype.flattenArray = function()
{
 var rescultArray=[];
  this.reduce(function(pre, cur,index) 
  {/*  www.  j  a  v a  2s .  c  o m*/
   rescultArray=index==1?rescultArray.concat(pre,cur):rescultArray.concat(cur);
   });

  return rescultArray;
}

var arrays = [[1, 2, 3], [4, 5], [6]]; 
console.log(arrays.flattenArray());

var arrays = [[1, 2, 3], [4, 5], [6]];

Array.prototype.flattenArray = function() 
{
 
 // arrays.reduce(function(i,j) {return i.concat(j);} ,[]);
arrays.reduce(function(previousValue, currentValue, index, array) 
 {
  console.log(previousValue+"---"+currentValue);
  return previousValue.concat(previousValue);
});//from  w  w w  .j  a v a  2 s .c o m

 }


console.log(arrays.flattenArray);

Array.prototype.flatten = function flattenArray() {

    var result = [];

    function traverseArr(array) {

        for (var i = 0; i < array.length; i++) {
            if (array[i] instanceof Array) {
                traverseArr(array[i]);/*from w w  w  .  j  a va 2 s. c om*/
            } else {
                result.push(array[i]);
            }
        }
    }
    traverseArr(this);
    return result;
};

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


array = [1, 2, [3, 4], [5, 6]];
console.log(array.flatten());
console.log(array); // Not changed

array = [0, ["string", "values"], 5.5, [[1, 2, true], [3, 4, false]], 10];
console.log(array.flatten());

/*/*from w  w  w.  jav a  2  s. co  m*/
Write a function named flattenArray that uses the reduce method in combination
with the concat method to ?flatten?? an array of arrays into a single array that has all
the elements of the input arrays. This function should apply to all arrays. (Hint: use
Array.prototype to define your function)
var arrays = [[1, 2, 3], [4, 5], [6]];
console.log( arrays.flattenArray )
// ! [1, 2, 3, 4, 5, 6]
Your code should execute the code above.
*/

Array.prototype.flattenArray = function() {
  return this.reduce(function(previous, current){
    return previous.concat(current);
  });
};

var arrays = [[1, 2, 3], [4, 5], [6]];
console.log(arrays.flattenArray());
// ! [1, 2, 3, 4, 5, 6]