const f = (x, g) => g(x);
const g1 = (x) => x + 1;
const g2 = (x) => x * 2;
console.log(f(1, g1)); //=> 2
console.log(f(2, g1)); //=> 3
console.log(f(1, g2)); //=> 2
console.log(f(2, g2)); //=> 4
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