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52 lines
2.4 KiB
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52 lines
2.4 KiB
HTML
<p>Given a function <code>fn</code>, an array of arguments <code>args</code>, and a timeout <code>t</code> in milliseconds, return a cancel function <code>cancelFn</code>.</p>
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<p>After a delay of <code>t</code>, <code>fn</code> should be called with <code>args</code> passed as parameters <strong>unless</strong> <code>cancelFn</code> was invoked before the delay of <code>t</code> milliseconds elapses, specifically at <code>cancelT</code> ms. In that case, <code>fn</code> should never be called.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> fn = (x) => x * 5, args = [2], t = 20, cancelT = 50
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<strong>Output:</strong> [{"time": 20, "returned": 10}]
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<strong>Explanation:</strong>
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const cancel = cancellable((x) => x * 5, [2], 20); // fn(2) called at t=20ms
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setTimeout(cancel, 50);
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The cancellation was scheduled to occur after a delay of cancelT (50ms), which happened after the execution of fn(2) at 20ms.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> fn = (x) => x**2, args = [2], t = 100, cancelT = 50
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<strong>Output:</strong> []
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<strong>Explanation:</strong>
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const cancel = cancellable((x) => x**2, [2], 100); // fn(2) not called
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setTimeout(cancel, 50);
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The cancellation was scheduled to occur after a delay of cancelT (50ms), which happened before the execution of fn(2) at 100ms, resulting in fn(2) never being called.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> fn = (x1, x2) => x1 * x2, args = [2,4], t = 30, cancelT = 100
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<strong>Output:</strong> [{"time": 30, "returned": 8}]
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<strong>Explanation:</strong>
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const cancel = cancellable((x1, x2) => x1 * x2, [2,4], 30); // fn(2,4) called at t=30ms
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setTimeout(cancel, 100);
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The cancellation was scheduled to occur after a delay of cancelT (100ms), which happened after the execution of fn(2,4) at 30ms.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>fn is a function</code></li>
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<li><code>args is a valid JSON array</code></li>
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<li><code>1 <= args.length <= 10</code></li>
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<li><code><font face="monospace">20 <= t <= 1000</font></code></li>
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<li><code><font face="monospace">10 <= cancelT <= 1000</font></code></li>
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</ul>
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