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const f = (y) => (x) => x + 2 * y; // const f = (y) => ((x) => x + 2 * y); // same const g1 = f(1); const g2 = f(2); console.log(g1(1)); //=> 3 console.log(g1(2)); //=> 4 console.log(g2(1)); //=> 5 console.log(g2(2)); //=> 6