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存量题库数据更新
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@@ -1,58 +1,80 @@
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Given a function <code>fn,</code> an array of arguments <code>args</code>, and an interval time <code>t</code>, return a cancel function <code>cancelFn</code>. The function <code>fn</code> should be called with <code>args</code> immediately and then called again every <code>t</code> milliseconds until <code>cancelFn</code> is called.
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<p>Given a function <code>fn</code>, an array of arguments <code>args</code>, and an interval time <code>t</code>, return a cancel function <code>cancelFn</code>.</p>
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<p>The function <code>fn</code> should be called with <code>args</code> immediately and then called again every <code>t</code> milliseconds until <code>cancelFn</code> is called at <code>cancelTimeMs</code> ms.</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 * 2, args = [4], t = 20, cancelT = 110
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<strong>Input:</strong> fn = (x) => x * 2, args = [4], t = 35
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<strong>Output:</strong>
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[
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{"time": 0, "returned": 8},
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{"time": 20, "returned": 8},
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{"time": 40, "returned": 8},
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{"time": 60, "returned": 8},
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{"time": 80, "returned": 8},
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{"time": 100, "returned": 8}
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{"time": 35, "returned": 8},
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{"time": 70, "returned": 8},
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{"time": 105, "returned": 8},
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{"time": 140, "returned": 8},
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{"time": 175, "returned": 8}
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]
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<strong>Explanation:</strong> Every 20ms, fn(4) is called. Until t=110ms, then it is cancelled.
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<strong>Explanation:</strong>
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const result = [];
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const fn = (x) => x * 2;
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const cancelTimeMs = 190;
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const cancel = cancellable(x => x * 2, [4], 20);
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setTimeout(cancel, 110);
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const start = performance.now();
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const log = (...argsArr) => {
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const diff = Math.floor(performance.now() - start);
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result.push({"time": diff, "returned": fn(...argsArr)});
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}
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const cancel = cancellable(log, [4], 35);
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setTimeout(cancel, cancelTimeMs);
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setTimeout(() => {
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console.log(result); // Output
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}, cancelTimeMs + 50)
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Every 35ms, fn(4) is called. Until t=190ms, then it is cancelled.
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1st fn call is at 0ms. fn(4) returns 8.
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2nd fn call is at 20ms. fn(4) returns 8.
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3rd fn call is at 40ms. fn(4) returns 8.
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4th fn call is at 60ms. fn(4) returns 8.
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5th fn call is at 80ms. fn(4) returns 8.
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6th fn call is at 100ms. fn(4) returns 8.
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2nd fn call is at 35ms. fn(4) returns 8.
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3rd fn call is at 70ms. fn(4) returns 8.
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4th fn call is at 105ms. fn(4) returns 8.
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5th fn call is at 140ms. fn(4) returns 8.
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6th fn call is at 175ms. fn(4) returns 8.
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Cancelled at 190ms
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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 = (x1, x2) => (x1 * x2), args = [2, 5], t = 25, cancelT = 140
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<strong>Input:</strong> fn = (x1, x2) => (x1 * x2), args = [2, 5], t = 30
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<strong>Output:</strong>
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[
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{"time": 0, "returned": 10},
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{"time": 25, "returned": 10},
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{"time": 50, "returned": 10},
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{"time": 75, "returned": 10},
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{"time": 100, "returned": 10},
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{"time": 125, "returned": 10}
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{"time": 30, "returned": 10},
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{"time": 60, "returned": 10},
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{"time": 90, "returned": 10},
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{"time": 120, "returned": 10},
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{"time": 150, "returned": 10}
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]
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<strong>Explanation:</strong> Every 25ms, fn(2, 5) is called. Until t=140ms, then it is cancelled.
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<strong>Explanation:</strong>
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const cancelTimeMs = 165;
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Every 30ms, fn(2, 5) is called. Until t=165ms, then it is cancelled.
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1st fn call is at 0ms
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2nd fn call is at 25ms
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3rd fn call is at 50ms
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4th fn call is at 75ms
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5th fn call is at 100ms
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6th fn call is at 125ms
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Cancelled at 140ms
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2nd fn call is at 30ms
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3rd fn call is at 60ms
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4th fn call is at 90ms
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5th fn call is at 120ms
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6th fn call is at 150ms
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Cancelled at 165ms
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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, x3) => (x1 + x2 + x3), args = [5, 1, 3], t = 50, cancelT = 180
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<strong>Input:</strong> fn = (x1, x2, x3) => (x1 + x2 + x3), args = [5, 1, 3], t = 50
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<strong>Output:</strong>
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[
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{"time": 0, "returned": 9},
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@@ -60,7 +82,10 @@ Cancelled at 140ms
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{"time": 100, "returned": 9},
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{"time": 150, "returned": 9}
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]
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<strong>Explanation:</strong> Every 50ms, fn(5, 1, 3) is called. Until t=180ms, then it is cancelled.
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<strong>Explanation:</strong>
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const cancelTimeMs = 180;
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Every 50ms, fn(5, 1, 3) is called. Until t=180ms, then it is cancelled.
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1st fn call is at 0ms
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2nd fn call is at 50ms
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3rd fn call is at 100ms
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@@ -72,9 +97,9 @@ Cancelled at 180ms
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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>fn</code> is a function</li>
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<li><code>args</code> is a valid JSON array</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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<li><code><font face="monospace">30 <= t <= 100</font></code></li>
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<li><code><font face="monospace">10 <= </font>cancelTimeMs<font face="monospace"> <= 500</font></code></li>
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</ul>
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