Nodejs Array Inject inject(callback)

Method Source Code

Array.prototype.inject = function (callback) {
  var accumulator = this[0];
  var body = this.slice(1, this.length);

  // function accumulate(el) {
  //   return callback(accumulator, el);
  // }/*w ww.  ja v a2  s.com*/

  body.each(function (el) {
    accumulator = callback(accumulator, el);
  });

  return accumulator;
};

var add = function (a, el) {
  return a + el;
}


var arr = ["hey", "yeah", "nah"];

Related

1. inject

   ===
   

2. inject(command, accumulator)

   Array.prototype.inject = function(command, accumulator){
     var start = 0;
     if(!accumulator){
       accumulator = this[0]
       start += 1;
     this.slice(start,this.length).each(function(el){
       accumulator = command(accumulator, el);
     });
   ...
   

3. inject(element)

   var express = require('express')
     , app = express()
     , server = require('http').createServer(app)
     , io = require('socket.io').listen(server);
   server.listen(3000);
   app.use(express.static(__dirname + '/public'));
   var messages = new Array()
   Array.prototype.inject = function(element) {
       if (this.length >= 5) {
   ...
   

4. inject(funct)

   Array.prototype.inject = function(funct) {
     var start = this.shift();
     var accum = start;
     var createInjection = function(num){
       if (accum = funct(accum, num));
     };
     this.myEach(createInjection);
     this.unshift(start);
     return accum;
   ...
   

5. inject(index, val)

   Array.prototype.inject = function(index, val){
     if(index <0){return this;}
     var a = this.slice(0, index), b = this.splice(index, this.length-index);
     a[index] = val;
     return a.concat(b);
   };