Google Script call another function to return a value - google-apps-script

Question

I'm getting to grips with beginner methods of GScript now but so far have only used one function. Could someone show me how to 'call' another function to check for something and then return a TRUE or FALSE. Here is my attempt (it will eventually check a lot of things but I'm just checking one thing to start..)
Function callAnotherFunctionAndGetResult () {
MyResult = call(CheckTrueFalse)
if(MyResult = True then.. do something)
};
function CheckTrueFalse() {
if(3 > 2) {
CheckTrueFalse = TRUE
Else
CheckTrueFalse = FALSE
};
So basically I just want to get the other function to check something (in this case is 3 bigger than 2?) if it is then return TRUE. From this I should have the knowledge to modify for the real purpose. I'm used to Visual Basic so I've written it more how that would look - I know that won't work. Could someone help me convert so will work with Google Script please?

Answer 1

A function with a return statement is what you're looking for. Assuming you need the called function to take some input from the main function:
function mainFunction() {
//...
var that = "some variable found above";
//call other function with input and store result
var result = otherFunction(that);
if (result) {
//if result is true, do stuff
}
else {
//if result is false, do other stuff
}
}
function otherFunction(that) {
var this = "Something"; //check variable
return (this == that);
//(this == that) can be any conditional that evaluates to either true or false,
//The result then gets returned to the first function
}
You could also skip assigning the result variable and just check the returned condition directly, i.e.:
if (otherFunction(that)) {
//do stuff
}
else {do other stuff}
Let me know if you need me to clarify any of the syntax or if you have any more questions.

Answer 2

Here's a basic sample that might help you:
function petType(myPet){
return myPet;
}
function mainFunctoin(){
var newPet = petType("dog");
if(newPet === "dog"){
Logger.log("true");
}else{
Logger.log("false");
}
}
Execute mainFunction().
If you set petType to "cat", it will return false; but, if you set it to "dog", it will return true.
Let me know if it helped.