Nodejs Array Reduce reduce(f, inital)

Here you can find the source of reduce(f, inital)

Method Source Code

// complete the implementation of sum and reduce such that reducing an array
// returns the sum of its values
// [0,1,2,3].fold(sum, 0) === 6

var arr = [0,1,2,3,4];

var sum = function(x, y) { return x + y; };

Array.prototype.reduce = function(f, inital) {
    var acc = initial;
    for (var i = 0; i < this.length; i++) {
        acc = f(acc, this[i]);/*  w ww . jav a 2 s .  c o m*/
    }
    return acc;
};

var total = arr.reduce(sum, 0);
console.log(total);

Related

  1. reduce(combiner, initialValue)
    Array.prototype.reduce = function(combiner, initialValue) {
      var counter,
        accValue;
      if (this.length === 0) {
        return this;
      else {
        if (arguments.length === 1) {
          counter = 1;
    ...
    
  2. reduce(combiner, initialValue)
    Array.prototype.reduce = function(combiner, initialValue) {
      var counter,
        accumulatedValue;
      if (this.length === 0) {
        return this;
      else {
        if (arguments.length === 1) {
          counter = 1;
    ...
    
  3. reduce(combiner, initialValue)
    Array.prototype.reduce = function (combiner, initialValue) {
      var counter,
        accumulatedValue;
      if (this.length === 0) {
        return this;
      if (arguments.length === 1) {
        counter = 1;
        accumulatedValue = this[0];
    ...
    
  4. reduce(combiner, initialValue)
    Array.prototype.reduce = function(combiner, initialValue) {
      var counter,
        accumulatedValue;
      if (this.length === 1) {
        return this;
      } else {
          if (arguments.length === 1) {
            counter = 1;
            accumulatedValue = this[0];
    ...
    
  5. reduce(f, firstValue)
    Array.prototype.reduce = function(f, firstValue){
       var value = firstValue;
       for (var i =0; i<this.length; i++){
          value = f(this[i], value);
       return value;
    };
    [1,2,3].reduce(function(currentValue ,value){return value+=currentValue;}, 0);
    [1,2,3].reduce(function(currentValue ,value){return value*=currentValue;}, 0);
    ...
    
  6. reduce(f, initial)
    var arr = [0,1,2,3,4];
    var sum = function(total, newValue) { return total + newValue; };
    Array.prototype.reduce = function(f, initial) {
        var acc = initial;
        for (var i = 0; i < this.length; i++) {
            acc = f(acc, this[i]);
        return acc;
    };
    ...
    
  7. reduce(f, value)
    Array.prototype.reduce = function (f, value) { 
        for (var i = 0; i < this.length; i++) { 
            value = f(this[i], value)
        return value
    
  8. reduce(f, value)
    Array.prototype.reduce = function (f, value) {
      for (var i = 0, len = this.length; i < len; i++) {
        value = f(this[i], value);
      return value;
    };
    var superheroes = ['superman', 'iron man', 'spiderman', 'batman'];
    var totalLength = superheroes.reduce(function (elem, acc) {
      return elem.length + acc;
    ...
    
  9. reduce(f, value)
    var data = [ 4, 8, 15, 16, 23, 42 ];
    Array.prototype.reduce = function(f, value) {
        var i;
        for (i = 0; i < this.length; i += 1) {
            value = f(this[i], value);
        return value;
    };
    var add = function(a, b) {
    ...