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const cache = {}; let called1 = 0; let called2 = 0; // This PR const cacheFunc1 = (k, fn) => { if (cache[k] != null) return cache[k]; const result = fn(); cache[k] = result; return result; } // PR #3744 const cacheFunc2 = (k, fn) => { if (cache[k] != null) return cache[k]; cache[k] = fn(); const result = fn(); return result; } cacheFunc1('1', () => { return called1++; }); cacheFunc1('1', () => { return called1++; }); cacheFunc1('1', () => { return called1++; }); cacheFunc2('2', () => { return called2++; }); cacheFunc2('2', () => { return called2++; }); cacheFunc2('2', () => { return called2++; }); console.log(called1, called2);