var add = function addnums(a,b)
{
return a+b;
}
alert("sum is " + addnums(10,20));
why can't i use addnums directly in the above Javascript ?
PS : I know other alternatives, the question is why the above specified method doesn't work.
2 Answers
You can.
var add = function addnums(a,b)
{
return a+b;
}
alert("sum is " + (function(a,b) { return a+b; })(10,20) );
Plus you may shorten the syntax:
var addnums = function(a,b) { ... }
or
function addnums(a,b) { ... }
4 Comments
Jan Turoň
Since all answers receive quick downvotes here, please explain why.
nik7
i am aware of other methods to make that work, just wanted to know why the method in question doesn't work
JJJ
You're not answering the question. The question is about why the function can't be referred to as
addnums after it's been declared.Jan Turoň
I see. Recently I've found some article about it, please wait for edit...
You have an error writing the function write like the following:
var addnums = function(a,b)
{
return a+b;
}
alert("sum is " + addnums(10,20));
:)
var add; is a declaration. Here add is declared and assigned a function you need not name the function after keyword function, variable name will take the function name when you define a function in this way. I think you understand now.
2 Comments
sdepold
Besides the fact, that the syntax of the questioners code is correct, he wants to know why the named function isn't callable via its name.
Md Toufiqul Islam
function expression does not need a name, even if you name it it will not be called by that name. This is anonymous. You can say it is a drawback but there are more advantages than disadvantages. Check out this link javascriptweblog.wordpress.com/2010/07/06/…
addnums(1,2)and viaadd(1,2).