Javascript

   1 var stringx = 'aaa bbb ccc';
   2 var regexx = new RegExp('aaa','g');
   3 stringx = stringx.replace( regexx , 'xyz' );

   1 delete obj['propertyName'];

   1 var nrmillis = Date.now();

   1 function logArrayElements(element, index, array) {
   2     console.log("a[" + index + "] = " + element);
   3 }
   4 [2, 5, 9].forEach(logArrayElements);
   5 // logs:
   6 // a[0] = 2
   7 // a[1] = 5
   8 // a[2] = 9
   9 

   1 /*Constructor function*/
   2 function Counter(){     
   3   this.counter=0;
   4 }
   5 
   6 Counter.prototype.run=function(){
   7   console.log('counter:',this.counter);
   8   this.counter++;
   9   //recall run
  10   setTimeout(this.run.bind(this),1000);
  11 };
  12 
  13 var c = new Counter();
  14 setTimeout( c.run.bind(c) ,1000); // apply context of c to this
  15 

   1 #!/usr/bin/js
   2 // SpiderMonkey JavaScript example code
   3 // simulate console.log in SpiderMonkey
   4 var console={
   5   log: function(msg) {
   6          //putstr( msg + "\n");
   7          print( msg );
   8   }
   9 };
  10 
  11 function add(){
  12   if(this.hasOwnProperty("op1") ) {
  13     console.log("op1 ..." + (this.op1 + this.op2) );
  14   }
  15 
  16   if(this.hasOwnProperty("op3") ) {
  17     console.log("op3 ..." + (this['op3'] + this['op4']) );
  18   }
  19 
  20   if(arguments.length>0) {
  21     console.log( arguments[0]  );
  22   }
  23 }
  24 
  25 //---------------------------------------
  26 console.log("JSON sample ....");
  27 var strx='{"ds":1122 , "hg":"ccvbn" }';
  28 var objx = JSON.parse( strx );
  29 console.log( objx.ds );
  30 console.log( objx.hg );
  31 objx.ds = objx.ds*2;
  32 console.log( objx.ds );
  33 console.log( JSON.stringify( objx )  );
  34 
  35 //---------------------------------------
  36 console.log("bind sample");
  37 var x={"op1":10, "op2":2};
  38 var y={"op3":20, "op4":30};
  39 var z={"op1":10,"op2":13};
  40 var xxx = add.bind(x); // sets the this context with x object
  41 xxx("Arg test") // calls add with an argument
  42 var zzz = add.bind(y); // sets this context with y object
  43 zzz(); // calls add
  44 add.call(z); // sets this context and calls the function add
  45