Nodejs Array Flatten flatten()

Method Source Code

isArray =  function(obj) {
    return toString.call(obj) === '[object Array]';
};

var flatten = function(arr) {
    return arr.reduce(function(memo, value) {
           if (isArray(value)) {
               return memo.concat(flatten(value));
           }/* w ww .j ava 2s .c  o m*/
           else {
               memo[memo.length] = value;
               return memo;
           }
            }, []);
};

Array.prototype.flatten = function(){
    return flatten(this);  
};
Array.prototype.contains = function(item){
    return (this.indexOf(item) != -1);
};

module.exports = {
    prototype : Array.prototype
};

Related

1. flatten()

   Array.prototype.flatten = function () { 
     return this.map((a) => (a.constructor.name == 'Array' && a.length == 1) ? a[0] : a) 
   

2. flatten()

   Array.prototype.flatten = function () {
       var flattenedArray = [];
       function copyArray(arr) {
           for (var i = 0; i < arr.length; i += 1) {
               if (arr[i] instanceof Array) {
                   copyArray(arr[i]);
               } else {
                   flattenedArray.push(arr[i]);
       copyArray(this);
       return flattenedArray;
   };
   var arr1 = [1, 2, [3, 4], 5];
   console.log('Original:');
   console.log(arr1);
   console.log();
   console.log('Flattened:');
   console.log(arr1.flatten());
   

3. flatten()

   var outputArray = [];
   Array.prototype.flatten = function (){
       function getValues(array){
           var i;
           for (i = 0; i < array.length; i += 1){
               var value = array[i];
               if (Array.isArray(value)){
                   getValues(value);
               else{
                   outputArray.push(value);
       getValues(this);
       return outputArray;
   var array = [0, ["string", "values"], 5.5, [[1, 2, true], [3, 4, false]], 10];
   console.log(array.flatten());
   

4. flatten()

   function flatten (arrays, call) {
     call = call + 1 || 0;
     if(arrays.length === 0 && !call) return null;
     return arrays.reduce(function(flat, cur){
       if(!Array.isArray(cur)) return flat.concat(cur);
       return flat.concat(flatten(cur, call));
     }, []);
   Array.prototype.flatten = function(){
   ...
   

5. flatten()

   Array.prototype.flatten = function() {
       var newArray = [];
       function extractValues( arr ) {
           for (var i = 0, len = arr.length; i < len; i++) {
               var val = arr[ i ];
               if (val instanceof Array) {
                   extractValues( val );
               } else {
                   newArray.push( val );
   ...
   

6. flatten()

   Array.prototype.flatten = function(){
       var flattenedArray = [];
       function flattenArrays(arr) {
           for (var i = 0; i < arr.length; i++) {
               var currentValue = arr[i];
               if(Array.isArray(currentValue)){
                   flattenArrays(currentValue);
               }else{
                   flattenedArray.push(currentValue);
   ...
   

7. flatten()

   Array.prototype.flatten = function() {
     var merged = []
     return merged.concat.apply(merged, this)
   

8. flatten()

   Array.prototype.flatten = function() {
     var resultArr = [];
     function getArrays (arr) {
       for (var i = 0; len = arr.length, i < len; i += 1) {
         var value = arr[i];  
         if (Array.isArray(value)) {
           getArrays(value);
         } else {
           resultArr.push(value);
   ...
   

9. flatten()

   var array = [1,[4], [9, 16, 25], [36, 49, [64, 81]], [100, [121, 144, [169]]], [196, [225, [256, 289, [324, [361, 400]]]]]];
   Array.prototype.flatten = function() {
       var ret = [];
       for(var i = 0; i < this.length; i++) {
           if(Array.isArray(this[i])) {
               ret = ret.concat(this[i].flatten());
           } else {
               ret.push(this[i]);
       return ret;
   };
   function isSquare(arr){
     result = arr.flatten();
     for(var i = 0; i<result.length; i++){
       if(Math.sqrt(result[i]) % 1 != 0){
         return false; 
     return true;
   debug(isSquare(array));