Nodejs Array Each each(f, callback)

Method Source Code

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]);//  w  w w  .j  a  v  a2  s .  c  om
    }
    if (callback) callback();
}

Array.prototype.asyncEach = function(f, callback, i) {
    i = i || 0;
    var l = this.length, that = this;
    function next() {
        that.asyncEach(f, callback, ++i);
    }
    i < l ? f(this[i], next) : callback();
}

String.prototype.beginsWith = function(str) {
    return this.indexOf(str) === 0;
}

String.prototype.endsWith = function(str) {
    return this.substr(this.length - str.length) === str;
}

exports.hash = function(str) {
    var sha = crypto.createHash('sha256')
    sha.update(str)
    return sha.digest('base64')
}

Related

1. each(f)

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

2. each(f)

   Array.create = function(f, count) {
       var arr = [];
       for (var i = 0; i < count; ++i) {
           arr.push(f(i));
       return arr;
   Array.prototype.each = function(f) {
       for (var i = 0; i < this.length; i += 1) {
   ...
   

3. each(f)

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

4. each(f)

   Array.prototype.each = function(f) {
     for (var 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]);
     return this;
   

6. each(f,r)

   Array.prototype.each = function(f,r){
     if(r===-1){
       for(var i=this.length-1;i>=0;i--)f(this[i],i);
     }else{
       for(var i=0,l=this.length;i<l;i++)f(this[i],i);
   };
   

7. each(fn)

   Array.prototype.each = function(fn) {
       if (!fn) return false;
       for(let i = 0, len = this.length; i < len; i++) {
           if (fn(this[i], i) === false) return false;
   

8. each(fn)

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

9. each(fn)

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