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29 lines
1.4 KiB
HTML
29 lines
1.4 KiB
HTML
Given two promises <code>promise1</code> and <code>promise2</code>, return a new promise. <code>promise1</code> and <code>promise2</code> will both resolve with a number. The returned promise should resolve with the sum of the two numbers.
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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>
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promise1 = new Promise(resolve => setTimeout(() => resolve(2), 20)),
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promise2 = new Promise(resolve => setTimeout(() => resolve(5), 60))
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<strong>Output:</strong> 7
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<strong>Explanation:</strong> The two input promises resolve with the values of 2 and 5 respectively. The returned promise should resolve with a value of 2 + 5 = 7. The time the returned promise resolves is not judged for this problem.
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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>
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promise1 = new Promise(resolve => setTimeout(() => resolve(10), 50)),
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promise2 = new Promise(resolve => setTimeout(() => resolve(-12), 30))
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<strong>Output:</strong> -2
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<strong>Explanation:</strong> The two input promises resolve with the values of 10 and -12 respectively. The returned promise should resolve with a value of 10 + -12 = -2.
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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>promise1</code> and <code>promise2</code> are promises that resolve with a number</li>
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</ul>
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