(8 kyu) You Cant Code Under Pressure 1.js

// 1 Plain solution
function doubleInteger(i) {
    // i will be an integer. Double it and return it.
    return 2 * i;
}

// 2 Optimized solution
const doubleInteger = i => 2 * i;

// 3 Clever solution
const doubleInteger = i => i << 1;