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Java-based LeetCode algorithm problem solutions, regularly updated

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2637\. Promise Time Limit

Medium

Given an asynchronous function `fn` and a time `t` in milliseconds, return a new **time limited** version of the input function. `fn` takes arguments provided to the **time limited **function.

The **time limited** function should follow these rules:

*   If the `fn` completes within the time limit of `t` milliseconds, the **time limited** function should resolve with the result.
*   If the execution of the `fn` exceeds the time limit, the **time limited** function should reject with the string `"Time Limit Exceeded"`.

**Example 1:**

**Input:** 

    fn = async (n) => { 
        await new Promise(res => setTimeout(res, 100)); 
        return n * n; 
    } 

inputs = [5] 

t = 50

**Output:** {"rejected":"Time Limit Exceeded","time":50}

**Explanation:** 

    const limited = timeLimit(fn, t) 
    const start = performance.now() 
    let result; 
    try { 
        const res = await limited(...inputs) 
        result = {"resolved": res, "time": Math.floor(performance.now() - start)}; 
    } catch (err) { 
        result = {"rejected": err, "time": Math.floor(performance.now() - start)}; 
    } 
    console.log(result) // Output 

The provided function is set to resolve after 100ms. However, the time limit is set to 50ms. It rejects at t=50ms because the time limit was reached.

**Example 2:**

**Input:** 

    fn = async (n) => { 
        await new Promise(res => setTimeout(res, 100)); 
        return n * n; 
    } 

inputs = [5] 

t = 150

**Output:** {"resolved":25,"time":100}

**Explanation:** The function resolved 5 * 5 = 25 at t=100ms. The time limit is never reached.

**Example 3:**

**Input:** 

    fn = async (a, b) => { 
        await new Promise(res => setTimeout(res, 120)); 
        return a + b; 
    } 

inputs = [5,10] 

t = 150

**Output:** {"resolved":15,"time":120}

**Explanation:** The function resolved 5 + 10 = 15 at t=120ms. The time limit is never reached.

**Example 4:**

**Input:** 

    fn = async () => { 
        throw "Error"; 
    } 

inputs = [] 

t = 1000

**Output:** {"rejected":"Error","time":0}

**Explanation:** The function immediately throws an error.

**Constraints:**

*   `0 <= inputs.length <= 10`
*   `0 <= t <= 1000`
*   `fn returns a promise`