Default function arguments

[Markus]

Is it possible to set default arguments for functions like you are able to in PHP?

Like so:

function(type = 'default', default = 'argument')
// ...
 

?

Cheers guys

[gits]

hi ...

not like that ... but you may use:

function my_func(arg0) {
    // if arg0 is not passed to my_func 
    if (typeof arg0 == 'undefined') {
        arg0 = 'default_val0';
    }
 
    // now use arg0 and further code
}

kind regards

[Markus]

hi ...

not like that ... but you may use:

function my_func(arg0) {
    // if arg0 is not passed to my_func 
    if (typeof arg0 == 'undefined') {
        arg0 = 'default_val0';
    }
 
    // now use arg0 and further code
}

kind regards

Yeh, thought that might be the case.
Was just looking for a prettier alternative ^_^

[acoder]

This should hopefully be supported in the next major version of JavaScript/ECMAScript or something similar. In the meantime, you could use something like this.

[rnd me]

function shout(message){
     alert( message || "hello world" )
}

[acoder]

That's effective in most cases,but if you pass null, false, 0, empty string, etc. it will return "hello world" which is probably not what you want.

[rnd me]

That's effective in most cases,but if you pass null, false, 0, empty string, etc. it will return "hello world" which is probably not what you want.

thats a good point. any falsy -evaluating variable would trigger the default.

if you want the defaults only upon undefineds, try something like:

  function shout(message){
    alert( message != undefined ? message : "hello world" )
  }
 

[mrhoo]

function (message){
         message= (message !== undefined)? message : "default" ;
}

!== not equal and same type