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.

Dominic Goulet · Accepted Answer · 2011-08-31 08:08:00Z

6

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!

answered Aug 31, 2011 at 8:08

Dominic Goulet

8,1437 gold badges33 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

anonymous-one Over a year ago

excellent! i was thinking about using a lack of passed param as a default value. thank you kindly!

sbr · Accepted Answer · 2013-03-13 22:48:28Z

1

Or just:

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

answered Mar 13, 2013 at 22:48

sbr

4,8735 gold badges46 silver badges51 bronze badges

Collectives™ on Stack Overflow

Default function parameters in JavaScript

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related