Trying to learn some Javascript so I can use the script field. I replaced the Hello World code with code from a W3Schools tutorial but it doesn’t work. What am I doing wrong?
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You have to define your function outside of Script():
function myFunction(a,b){
return a * b;
}
function Script(){
var x = myFunction(4, 3);
return x;
}
Script();
@John cesta
Because x is the variable where the result 12 will be stored.Also I can change the arguments there. That’s what I got from it anyway. I’m new to JS and I copy and pasted it exactly as it was in the tutorial where it worked fine.
When JavaScript reaches a return statement, the function will stop executing.
If the function was invoked from a statement, JavaScript will “return” to execute the code after the invoking statement.
Functions often compute a return value. The return value is “returned” back to the “caller”:
Example
Calculate the product of two numbers, and return the result:
var x = myFunction(4, 3); // Function is called, return value will end up in x
function myFunction(a, b) {
return a * b; // Function returns the product of a and b
}
The result in x will be:
12
Hi DJ,
Daniel is correct in his sample. However, you may be able to just add return x; after your second last } but before the last }. Basically your function is returning x, but you’re not returning the result of x to the Script() function.
@Brendan
Thank you Brendan! That works! I went back to the tutorial and ran it again and in their ‘Try it yourself’ editor. It runs in an HTML doc type and has the following line to get x:
document.getElementById(“demo”).innerHTML = x;
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Functions</h2>
<p>This example calls a function which performs a calculation and returns the result:</p>
<p id=”demo”></p>
var x = myFunction(4, 3);
document.getElementById(“demo”).innerHTML = x;
function myFunction(a, b) {
return a * b;
}
</body>
</html>
@ Daniel Leu
Thanks again Daniel, I like your way as well. It makes sense.
Daniel’s example is a much better way of structuring your calls in my opinion. I was just providing input to show you how your current nested structure could work.
@ Brendan
I agree! I wish I was following his JavaScript tutorial!
You hear that @ Daniel Leu?
.
