Nodejs Array Flatten flatten()

Method Source Code

Array.prototype.flatten = function () {
    //from  w w  w .  j av  a2s  .c  o  m
    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 {
                result.push(array[i]);
            }
        }
        return result;
    } 
    return flattenArrayOfArrays(this);
}

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

console.log("Second sample code");
var array = [1, 2, [3, 4], [5, 6]];
console.log(array);
console.log(array.flatten());
console.log();

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

Related

1. flatten()

   Array.prototype.flatten = function() {
       var originalArray = this;
       var newArray = [];
       var i = 0;
       var j = 0;
       var element;
       var temp;
       for (i = 0; i < originalArray.length; i+=1) {
           element = originalArray[i];
   ...
   

2. flatten()

   Array.prototype.flatten = function() {
       var resultArray = [];
       innerFlatten(this);
       function innerFlatten(arr) {
           arr.forEach(function(el) {
               if(Array.isArray(el)) {
                   innerFlatten(el);
               } else {
                   resultArray.push(el);
   ...
   

3. 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}
     ]
   ...
   

4. flatten()

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

5. flatten()

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

6. 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;
     }, []);
   

7. flatten()

   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 {
         toReturn.push(this[i]);
     return toReturn;
   };
   

8. flatten()

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

9. 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 {
   ...