JuniorTheoryCommon

What does the program print?

JavaScript

function diff(a, b) {
    return a - b;
}

console.log(diff(10, diff(6, 2)));

Expecting 2: reading it as 10 - 6 - 2 from left to right. The inner call runs first and returns 4, and only then diff(10, 4) returns 6.
Expecting -14: thinking the arguments fill the parameters from the end. The first argument goes to a and the second to b, so diff(6, 2) is 4.

JuniorTheoryCommon

JavaScript

function diff(a, b) {
    return a - b;
}

console.log(diff(10, diff(6, 2)));

Expecting 2: reading it as 10 - 6 - 2 from left to right. The inner call runs first and returns 4, and only then diff(10, 4) returns 6.
Expecting -14: thinking the arguments fill the parameters from the end. The first argument goes to a and the second to b, so diff(6, 2) is 4.