title: How can I sum properties from two objects?
body: <p>I have multiple JavaScript objects:</p>
  <pre><code>{
    a: 12,
    b: 8,
    c: 17
  }
  </code></pre>
  <p>and</p>
  <pre><code>{
    a: 2,
    b: 4,
    c: 1
  }
  </code></pre>
  <p>I need to sum these two object by keys</p>
  <p>Result:</p>
  <pre><code>{
    a: 14,
    b: 12,
    c: 18
  }
  </code></pre>
  <p>Do you have any solutions in JavaScript?
  I use <code>Object.keys.map</code> but it's too long because I have like 100 elements in my object.</p>