add-two-promises

JavaScript

Add Two Promises

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addTwoPromises

Given two promises <code>promise1</code> and <code>promise2</code>, return a new promise. <code>promise1</code> and <code>promise2</code>&nbsp;will both resolve with a number. The returned promise should resolve with the sum of the two numbers.
&nbsp;
Example 1:

<pre>
Input: 
promise1 = new Promise(resolve =&gt; setTimeout(() =&gt; resolve(2), 20)), 
promise2 = new Promise(resolve =&gt; setTimeout(() =&gt; resolve(5), 60))
Output: 7
Explanation: 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.
</pre>

Example 2:

<pre>
Input: 
promise1 = new Promise(resolve =&gt; setTimeout(() =&gt; resolve(10), 50)), 
promise2 = new Promise(resolve =&gt; setTimeout(() =&gt; resolve(-12), 30))
Output: -2
Explanation: 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.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>promise1</code> and <code>promise2</code> are&nbsp;promises that resolve&nbsp;with a number</li>
</ul>

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