Nodejs Array Each each(f)

Method Source Code

// Miscellaneous support code for Lecture 5

// Functional to create a new length-'count' array,
// by calling a function that many times, each time passing it the current index.
Array.create = function(f, count) {
    var arr = [];

    for (var i = 0; i < count; ++i) {
        arr.push(f(i));//from   w  w w .  j a  v  a  2  s.  c om
    }

    return arr;
}

// Call a function on every data value in an array, in order.
Array.prototype.each = function(f) {
    for (var i = 0; i < this.length; i += 1) {
        f(this[i]);
    }
};

// Call a function on every index and data value in an array, in order.
Array.prototype.eachi = function(f) {
    for (var i = 0; i < this.length; i += 1) {
        f(i, this[i]);
    }
};

// Step through an array in order, using a function to combine elements,
// beginning with an initial accumulator.
Array.prototype.reduce = function(f, acc) {
    this.each(function(x) { acc = f(x, acc); });
    return acc;
};

Related

1. each(f)

   Array.prototype.each = function(f)
       for (var i = 0; i < this.length; i++)
           f(this[i])
       return this
   

2. each(f)

   Array.prototype.each = function(f) {
     for(var i = 0, len = this.length; i < len; i++) {
       f(this[i]);
   };
   RegExp.escape = function(s) {
       return s.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&');
   };
   

3. each(f)

   Array.prototype.each = function(f) {
       var res;
       for(var i = 0; i < this.length; i++) {
           res = f.call(i, this[i]);
       return res;
   

4. each(f)

   Array.prototype.each = Array.prototype.each || function (f) {
     var i;
     for (i = 0; i < this.length; ++i) {
       f(this[i], i);
   };
   

5. each(f)

   Array.prototype.each = function(f) {
     for(var i = 0; i < this.length; i++)
       f(this[i], i);
   };
   

6. each(f)

   Array.prototype.each = function(f) {
       for (var i = 0; i < this.length; i++)f(this[i], i, this)
   };
   

7. each(f)

   Array.prototype.each = function(f) {
     for (var i = 0; i < this.length; i++) {
       f(this[i], i);
   };
   

8. each(f)

   Array.prototype.each = function(f) {
     for (var i = 0; i < this.length; ++i) {
       f(this[i]);
     return this;
   

9. each(f, callback)

   var crypto = require('crypto')
   var http = require('http');
   Array.prototype.each = function(f, callback) {
       for (var i = 0, l = this.length; i < l; i++) {
           f(this[i]);
       if (callback) callback();
   Array.prototype.asyncEach = function(f, callback, i) {
   ...