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Showing posts from October, 2015

Javascript (ECMAScript 5.1) Refresher

I’ve been recently working heavily on JavaScript based applications in both Node.js and a Chrome extension. After working mostly on Java, I thought I’d share the syntax, conventions and the new features of ECMAScript 5.1 and parts of the still pending version, ES6/ECMAScript 2015, that I’ve come across. Comparisons Operators== equal to === equal value and equal type != not equal !== not equal value or not equal type I saw something else I thought was a fancy notation: if (!!something)
//which is not a special operator, it just converts it to boolean, i.e a double not.
(!!something) === (!(!something))
//this would only be useful if you want to set a boolean to something truthy, i.e.
var a = "somevalue";
var asBoolean = !!"somevalue";
Object InitializerSomething I had thought was not a fully adopted syntax, was being able to specify the getter / setter functions in the initializer. (MDN Object initializer) var o = {
func1: function (p1, p2) {},
get prop1() { ret…