<pre class="shiki github-dark shaku"><code>/** * @param {any} data * @return {string} */function detectType(data) { if(data instanceof FileReader) return 'object' else return typeof data === 'object' ? Object.prototype.toString.call(data).slice(1, -1).split(' ')[1].toLowerCase() : typeof data}</code></pre>

This is my accepted solution

This is an easy problem. For all the basic data types in JavaScript, how could you write a function to detect the type of arbitrary data? Besides basi…