User:Jarle Pahr/Javascript: Difference between revisions
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Penguin.prototype = new Animal(); | Penguin.prototype = new Animal(); | ||
Extending the prototype: | |||
classname.prototype = function(){...new function...} | |||
Check if object has property: | |||
object.hasOwnProperty(propertyname) |
Revision as of 06:04, 25 September 2013
http://en.wikipedia.org/wiki/JavaScript
https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
https://itunes.apple.com/us/itunes-u/programming-abstractions/id384232917
Examples
Function definition:
var multiplybytwo = function (number) { var val = number * 2; console.log(val); };
Declare a variable:
var myage = 25;
Confirm dialog:
confirm("You rock!")
Print to screen:
console.log('Hello world')
Equal to:
console.log(5 === 7)
Not equal to:
A !== B
If:
if condition //if condition is true { execute some code }
If/else:
if condition { execute some code } else { execute some other code }
Substrings:
"wonderful day".substring(3,7)
Class prototypes:
Inheritance:
Penguin.prototype = new Animal();
Extending the prototype:
classname.prototype = function(){...new function...}
Check if object has property:
object.hasOwnProperty(propertyname)