If you'll recall from our discussion of Storing Values with the Assignment Operator, everything to the right of the equal sign is resolved before the value is assigned. This means we can take the return value of a function and assign it to a variable.
Assume we have pre-defined a function
sum which adds two numbers together, then:
ourSum = sum(5, 12);
sum function, which returns a value of
17 and assigns it to
processArg function with an argument of
7 and assign its return value to the variable