JavaScript Solution
Code\njavascript []\n/**\n * @param {Function} fn\n * @param {Array} args\n * @param {number} t\n * @return {Function}\n */\nconst cancellable = (fn, args, t) =
# Code\n```javascript []\n/**\n * @param {Function} fn\n * @param {Array} args\n * @param {number} t\n * @return {Function}\n */\nconst cancellable = (fn, args, t) => {\n    const cancelFn = () => {\n        clearTimeout(timer)\n    };\n    const timer = setTimeout(() => {\n        fn(...args)\n    }, t);\n    return cancelFn;\n};\n\n/**\n *  const result = [];\n *\n *  const fn = (x) => x * 5;\n *  const args = [2], t = 20, cancelTimeMs = 50;\n *\n *  const start = performance.now();\n *\n *  const log = (...argsArr) => {\n *      const diff = Math.floor(performance.now() - start);\n *      result.push({"time": diff, "returned": fn(...argsArr)});\n *  }\n *       \n *  const cancel = cancellable(log, args, t);\n *\n *  const maxT = Math.max(t, cancelTimeMs);\n *           \n *  setTimeout(cancel, cancelTimeMs);\n *\n *  setTimeout(() => {\n *      console.log(result); // [{"time":20,"returned":10}]\n *  }, maxT + 15)\n */\n```
['JavaScript']