We are required to write a JavaScript function that takes in a string and returns the character which makes second most appearances in the string.
Example
Following is the code −
const str = 'Hello world, I have never seen such a beautiful weather in the world'; const secondFrequent = str => { const map = {}; for(let i = 0; i < str.length; i++){ map[str[i]] = (map[str[i]] || 0) + 1; }; const freqArr = Object.keys(map).map(el => [el, map[el]]); freqArr.sort((a, b) => b[1] - a[1]); return freqArr[1][0]; }; console.log(secondFrequent(str));
Output
Following is the output in the console −
e