<pre class="language-javascript"><code class="language-javascript">
/**
 * @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…