## page was renamed from JavascriptRegularExpression
= Javascript =

== Create an regular expression object ==
Replace string 'aaa' by 'xyz'.

{{{#!highlight javascript
var stringx = 'aaa bbb ccc';
var regexx = new RegExp('aaa','g');
stringx = stringx.replace( regexx , 'xyz' );
}}}

== Delete property from object ==
{{{#!highlight javascript
delete obj['propertyName'];
}}}

== Number of milliseconds since epoch ==
{{{#!highlight javascript
var nrmillis = Date.now();
}}}

== Foreach in array ==
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

{{{#!highlight javascript
function logArrayElements(element, index, array) {
    console.log("a[" + index + "] = " + element);
}
[2, 5, 9].forEach(logArrayElements);
// logs:
// a[0] = 2
// a[1] = 5
// a[2] = 9
}}}

== Context with this and bind ==
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.

{{{#!highlight javascript
/*Constructor function*/
function Counter(){     
  this.counter=0;
}

Counter.prototype.run=function(){
  console.log('counter:',this.counter);
  this.counter++;
  //recall run
  setTimeout(this.run.bind(this),1000);
};

var c = new Counter();
setTimeout( c.run.bind(c) ,1000); // apply context of c to this
}}}