{ "data": { "question": { "questionId": "2821", "questionFrontendId": "2715", "boundTopicId": null, "title": "Execute Cancellable Function With Delay", "titleSlug": "execute-cancellable-function-with-delay", "content": "

Given a function fn, an array or arguments args, and a timeout t in milliseconds, return a cancel function cancelFn.

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After a delay of t, fn should be called with args passed as parameters unless cancelFn was called first. In that case, fn should never be called.

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Example 1:

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\nInput: fn = (x) => x * 5, args = [2], t = 20, cancelTime = 50\nOutput: [{"time": 20, "returned": 10}]\nExplanation: \nconst cancel = cancellable(fn, [2], 20); // fn(2) called at t=20ms\nsetTimeout(cancel, 50);\n\nthe cancelTime (50ms) is after the delay time (20ms), so fn(2) should be called at t=20ms. The value returned from fn is 10.\n
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Example 2:

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\nInput: fn = (x) => x**2, args = [2], t = 100, cancelTime = 50\nOutput: []\nExplanation: fn(2) was never called because cancelTime (50ms) is before the delay time (100ms).\n
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Example 3:

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\nInput: fn = (x1, x2) => x1 * x2, args = [2,4], t = 30, cancelTime = 100\nOutput: [{"time": 30, "returned": 8}]\nExplanation: fn(2, 4) was called at t=30ms because cancelTime > t.\n
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Constraints:

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Node.js 16.13.2.

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Your code is run with --harmony flag, enabling new ES6 features.

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lodash.js library is included by default.

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For Priority Queue / Queue data structures, you may use 5.3.0 version of datastructures-js/priority-queue and 4.2.1 version of datastructures-js/queue.

\"], \"typescript\": [\"Typescript\", \"

TypeScript 4.5.4, Node.js 16.13.2.

\\r\\n\\r\\n

Your code is run with --harmony flag, enabling new ES2020 features.

\\r\\n\\r\\n

lodash.js library is included by default.

\"]}", "libraryUrl": null, "adminUrl": null, "challengeQuestion": null, "__typename": "QuestionNode" } } }