Nodejs Array Flatten flatten()

Method Source Code

/*Implement a function flatten() which works on an array of arrays and returns a new array (does not modify the original one).
  The function extracts all inner arrays and merges all values into a single-dimensional array.*/

Array.prototype.flatten = function() {
    var resultArray = [];
    innerFlatten(this);//  w w  w.j a va 2s  . c om
    function innerFlatten(arr) {
        arr.forEach(function(el) {
            if(Array.isArray(el)) {
                innerFlatten(el);
            } else {
                resultArray.push(el);
            }
        });
    }

    return resultArray;
};

var array = [1, 2, 3, 4];
console.log(array.flatten());// Not changed
var array = [1, 2, [3, 4], [5, 6]];
console.log(array.flatten());
var array = [0, ["string", "values"], 5.5, [[[1, 2], true], [3, 4, false]], 10];
console.log(array.flatten());

Related

1. flatten()

   Array.prototype.flatten = function() {
     var results = [];
     for (var i = 0, len = this.length; i < len; i++) {
       if (typeof this[i] == "object" && this[i].constructor === Array) {
         results = results.concat(this[i].flatten());
       } else {
         results.push(this[i]);
     return results;
   };
   Array.prototype.flatten = function() {
     var results = [];
     for (var i = 0, len = this.length; i < len; i++) {
       results = results.concat(Object.isArray(this[i]) ? this[i].flatten() : [this[i]]);
     return results;
   };
   Array.prototype.flatten = function() {
     return this.inject([], function(array, value) {
       return array.concat(Object.isArray(value) ?
         value.flatten() : [value]);
     });
   };
   

2. flatten()

   Array.prototype.flatten = function() {
       var resultArray = [];
       function getValues(array) {
           var i;
           for (i = 0; i < array.length; i += 1) {
               var value = array[i];
               if (Array.isArray(value)) {
                   getValues(value);
               } else {
   ...
   

3. flatten()

   Array.prototype.flatten = function() {
     var toString = Object.prototype.toString;
     var arrayTypeStr = '[object Array]';
     var result = [];
     var nodes = this.slice();
     var node;
     if (!this.length) {
       return result;
     node = nodes.pop();
     do {
       if (toString.call(node) === arrayTypeStr) {
         nodes.push.apply(nodes, node);
       } else {
         result.push(node);
     } while (nodes.length && (node = nodes.pop()) !== undefined);
     result.reverse();
     return result;
   

4. flatten()

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

5. 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];
   ...
   

6. 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}
     ]
   ...
   

7. flatten()

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

8. flatten()

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

9. 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 {
   ...