<pre class="shiki github-dark shaku"><code>/** * @param {string} str * @returns {boolean} */function validateNumberString(str) { // your code here return +str == str &amp;&amp; Boolean(str)}</code></pre>

Have a look here too :P

Give a number string, check if it is valid number. By "valid", we mean if it validates as one of below formats: 1. integer, such as '0', '-1' 2. decim…