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 07-03-2011, 11:53 PM PM User | #1 PonchoX New Coder   Join Date: Apr 2009 Location: Newport Beach, California Posts: 94 Thanks: 11 Thanked 1 Time in 1 Post Newbie question about functions + variables hi. i know a little php, but new to javascript. much of the syntax is identical. in reading the new rhino book (flanagan 6th), he gives the following example: Code: ```var square = function(x) { return x*x; };``` okay, but then he does this: Code: `square(plus1(y))` as an example of "invoking two functions in one expresson". (Prior he gives an example of defining a function with plus1, which is how I normally think of functions.) uh, square is a *variable*, but he is using it as a FUNCTION. Can somebody help me understand how this can be? how it works? I'm having trouble conceptualizng how we use a variable as a function. __________________ Radified
 07-04-2011, 12:28 AM PM User | #2 bullant Banned   Join Date: Feb 2011 Posts: 2,699 Thanks: 13 Thanked 395 Times in 395 Posts The way square is defined is the same as Code: ```function square(x) { return x * x; }``` and so `square `is a function as well. In your example Code: `square(plus1(y))` The `plus1()` function is evaluated first with `y` as input. `plus1()`then returns a value which is then used as input to the `square()` function.

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