<pre class="shiki github-dark shaku"><code>/** * @param {string} str * @returns {string | string[]} * * */function count(str) { let obj={}; for(let i=0; i&lt;str.length; i++){ if(obj[str[i]]){ obj[str[i]]+=1; } else { obj[str[i]]=1; } } let max = Math.max(...Object.values(obj)), res=[]; for(let [key,value] of Object.entries(obj)){ if(value === max) { res.push(key); } } return res.length &gt; 1 ? res : res[0];}</code></pre>

This is my accepted solution

Given a non-empty string, return the most frequently ocurring character. If there are multiple characters with same occurrance, return an array of the…