How to check if the same function name is already used in javascript

[Wootaek Choi]

Hi, everybody..

I try to make common debug function
that call in every js files used in a HTML..

but if same debug function name is defined in.... more than two javascrpt files,
it would cause trouble.

so, I want to check if the function name is used at first,
and then define debug function.
Is the anyway for this?

 

[Fox]

Hi, everybody..

I try to make common debug function
that call in every js files used in a HTML..

but if same debug function name is defined in.... more than two javascrpt files,
it would cause trouble.

so, I want to check if the function name is used at first,
and then define debug function.
Is the anyway for this?

if(!debug)
{
function
debug()
{
// whatever your code is...
}
}

 

[Andy Fish]

I don't think it would actually cause any harm if you defined the function
twice. In javascript that's just like assigning a variable the same value it
already has.

as a matter of good practice I would use fox's suggestion though

 

[Lasse Reichstein Nielsen]

if(!debug)
{
function
debug()
{
// whatever your code is...
}
}

if the browser follows the ECMA specification, then that function is
not a function declaration, but a function expression. The name is then
only visible inside the function.

A lot of browsers don't, but that's not an excuse

This will be safer:
---
if (!debug) {
var debug = function() {
//code
};
}