Returning Functions

Functions stop executing at two points; when it finishes executing all statements in the function body or when it encounters a return statement. This return statement mostly also has a return value associated with it, which is returned to the caller.

The function sum(a, b, c) in the following code block implements the sum of three numbers and returns the sum. This sum is then returned to the variable that calls the function, which is named as result here. Printing the value of the variable result tells us the value of the sum computed by the function.

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function sum(a, b, c){

    d = a + b + c

    return d

}

​

var result = sum(33, 12, 47)

console.log(result) //prints 92