Nodejs Array Inject inject(element)

Method Source Code

var express = require('express')
  , app = express()// ww w. j a  v a2  s.  com
  , 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) {
        this.shift()
    }
    this.push(element)
}

io.sockets.on('connection', function(socket) {
    socket.emit("init", JSON.stringify(messages));

    socket.on('msg', function(msg) {
        var message = JSON.parse(msg)
        messages.inject(message)

        socket.broadcast.emit('msg', msg)
    });

    socket.on('disconnect', function() {
    });
});

Related

1. inject

   ===
   

2. inject(callback)

   Array.prototype.inject = function (callback) {
     var accumulator = this[0];
     var body = this.slice(1, this.length);
     body.each(function (el) {
       accumulator = callback(accumulator, el);
     });
     return accumulator;
   };
   var add = function (a, el) {
   ...
   

3. 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);
     });
   ...
   

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);
   };
   

6. 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;
   };
   

7. 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;