Nodejs Array ForEach forEach(callback)

Here you can find the source of forEach(callback)

Method Source Code

Array.prototype.forEach = function(callback){
    let arr = this;/*from ww  w.  j  av a  2 s  .c o m*/
    for (var i = 0; i < arr.length; i++) {
        callback(arr[i], i, arr);
    }
}

Related

  1. forEach
    ===
    
  2. forEach()
    Array.prototype.forEach = Array.prototype.forEach || _forEach
    Array.prototype.every = Array.prototype.every || _every
    Array.prototype.indexOf = Array.prototype.indexOf || function(member) {
      for(var idx = 0; idx < this.length; ++idx) {
        if(this[idx] === member) {
          return idx
      return -1
    ...
    
  3. forEach(a)
    "use strict"
    Array.prototype.forEach = function(a) {
      for (let i = 0; i < this.length; i++) a(this[i], i, this)
    
  4. forEach(action, index)
    Array.prototype.forEach = Array.prototype.forEach || function(action, index) {
        for (var i=0,l=this.length; i<l; i++) {
            action(this[i], index);
    };
    
  5. forEach(callback)
    Array.prototype.forEach = function(callback){
      var a = 0,
        len = this.length;
      while(a < len){
        callback(this[a], a++, this);
    };
    
  6. forEach(callback)
    Array.prototype.forEach = Array.prototype.forEach || function (callback) {
        var self = this;
        for (var i = 0; i < self.length; i++) {
            var item = self[i];
            callback(item, i, self);
    
  7. forEach(callback, context)
    Array.prototype.forEach = Array.prototype.forEach || function (callback, context) {
      context = context || window;
      var l = this.length;
      for (var i = 0; i < l; i++)
        callback.call(context, this[i], i, this);
    };
    
  8. forEach(callback, context)
    Array.prototype.forEach = function (callback, context) {
        for (var index in this) {
            var item = this[index];
            if (!callback(index, item, context)) {
                break;
    };