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This approach leverages JavaScript's built-in setTimeout and clearTimeout functions. We schedule a timeout to execute the function fn after t milliseconds, and we return a cancelFn that, when called, cancels this scheduled timeout.
In C, without a standard set of functions for asynchronous timeouts, it's less about algorithmic complexity and more about the overhead of managing threads, which varies based on the implementation details.
C does not have direct support for asynchronous delay management similar to setTimeout in JavaScript, particularly in standard libraries. Such functionality generally requires external libraries or platform-specific code for thread and timer management.
This alternative approach involves using Promises to manage asynchronous execution and potential cancelation. By wrapping the setTimeout within a Promise, we can have more control over its execution and cancelation by managing the Promise lifecycle.
Time Complexity and space complexity would depend on the specific threading mechanism and the use of synchronization primitives.
1function cancellableWithPromise(fn, args, t) {
2 let cancelFn;
3
4 const promise = new Promise((resolve) => {
5 const timeoutId = setTimeout(() => {
6 resolve(fn(...args));
7 }, t);
8
9 cancelFn = () => {
10 clearTimeout(timeoutId);
11 resolve('Cancelled');
12 };
13 });
14
15 return { promise, cancelFn };
16}
17
18// Example usage
19const fn = (x) => console.log(x * 5);
20const { promise, cancelFn } = cancellableWithPromise(fn, [2], 20);
21
22// Simulate cancel call
23setTimeout(() => {
24 cancelFn();
25 promise.then((result) => console.log(result));
26}, 10);This JavaScript approach utilizes Promise for handling asynchronous calls and providing a cancelation mechanism. The promise resolves either after the intended delay executing the function or canceling the timeout and resolving with a message if canceled.