Nodejs Array Reduce reduce(t, fn)

Method Source Code

Array.prototype.reduce = function(t, fn) {
   for(var i = 0 ; i < this.length ; i++) {
      t = fn(t, this[i])/*  ww  w  .j  a  v  a2s . com*/
   }
   return t
}

Related

1. reduce(fun /*, initial*/)

   Array.prototype.reduce = Array.prototype.reduce || function(fun ) {
       var len = this.length >>> 0;
       if (typeof fun != "function") {
           throw new TypeError();
       if (len == 0 && arguments.length == 1) {
           throw new TypeError();
       var i = 0;
   ...
   

2. reduce(pasteback, initial)

   'use strict';
   Array.prototype.reduce = function(pasteback, initial){
     for(var i = 0
         , c =  this.length
         , value = arguments.length>1 ? initial : this[i++]
     ; i<c; i++){
       value = pasteback(value, this[i], i, this);
     return value;
   ...
   

3. reduce(process, initial)

   Array.prototype.reduce = function(process, initial) {
     var value = initial;
     for (var i = 0; i < this.length; i++) {
       if( ( i === 0 ) && ( value === undefined || value === null ))
           value = this[0];
           continue;
       value = process( value, this[i] );
   ...
   

4. reduce(process, initial)

   Array.prototype.reduce = function(process, initial) {
     if (initial === undefined) {
       var slice = this.slice(1);
       initial = this[0];
     var array = slice || this;
     array.forEach(function(value) {
       initial = process(initial, value);
     });
   ...
   

5. reduce(reducingFunction, initialValue)

   Array.prototype.reduce = function(reducingFunction, initialValue) {
     var result = initialValue;
     this.forEach(function(x) {
       reducingFunction(result, x)
     });
     return result;
   

6. reduce(testFunction,initialValue)

   Array.prototype.reduce = function(testFunction,initialValue){
     var accumulatedValue,counter;
     if(this.length == 0){
       return this;
     }else{
       if(arguments.length == 1){
         counter = 1;
         accumulatedValue = this[0];
       }else if(arguments.length >= 2){
   ...
   

7. reduce(testFunction,initialValue)

   Array.prototype.reduce = function(testFunction,initialValue){
     var accumulatedValue,counter;
     if(this.length == 0){
       return this;
     }else{
       if(arguments.length == 1){
         counter = 1;
         accumulatedValue = this[0];
       }else if(arguments.length >= 2){
   ...
   

8. reduce(testFunction,initialValue)

   Array.prototype.reduce = function(testFunction,initialValue){
     var accumulatedValue,counter;
     if(this.length == 0){
       return this;
     }else{
       if(arguments.length == 1){
         counter = 1;
         accumulatedValue = this[0];
       }else if(arguments.length >= 2){
   ...
   

9. reduce.call(str, (trav, char)>

   'use strict';
   class PrefixTree {
       constructor() {
           this.root = {};
       insert(str) {
           Array.prototype.reduce.call(str, (trav, char) => {
               if (!trav[char]) {
                   trav[char] = {};
   ...