Nodejs Array Inject inject(result, injectFunction)

Method Source Code

Array.prototype.inject = function(result, injectFunction) {
    this.each(function(element) {
        result = injectFunction(result, element);
    });//from   w w w .  j a  va  2 s. c om
    
    return result;
};

Related

1. 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) {
   ...
   

2. 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;
   ...
   

3. 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);
   };
   

4. inject(memo, fn)

   Array.prototype.inject = function(memo, fn) {
     for(var i = 0; i < this.length; i++) {
       memo = fn(memo, i, this[i]);
     };
     return memo;
   };
   

5. inject(memo, iterator, context)

   Array.prototype.inject = function(memo, iterator, context) {
       this.each(function(value, index) {
         memo = iterator.call(context, memo, value, index);
       });
       return memo;