title: Addition with decimal React Native doesnt return number
body: <p>I am in a project building simple mathematic app with react native. but when my input is added with decimal number, it doesnt sum, but it just merge</p>
  <pre><code>var height = 56
  const convertHeight = height+0.7
  </code></pre>
  <p>it return 560.7, instead of 56.7</p>