Default function parameters in JavaScript

Question

Is it possible to set default parameter values for functions in JavaScript like with PHP?

function phpFunc($param='defvalue'){ echo $param; } phpFunc(); 

Would result in 'defvalue' being outputted...

Is this possible in javascript?

Thanks.

Answer 1

No, it's not possible. You would have to do something like this :

function jsFunc(param) { param = typeof param == 'undefined' ? 'defvalue' : param; return param; } alert( jsFunc() ); // shows defvalue alert( jsFunc('Hello, world!'); // shows Hello, world! 

Hope this helps!

Answer 2

Or just:

function jsFunc(param){ param = param || defValue; return param; }