[Algorithm] Max Chars Problem

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// --- Directions // Given a string, return the character that is most // commonly used in the string. // --- Examples // maxChar("abcccccccd") === "c" // maxChar("apple 1231111") === "1"   function maxChar(str) {   let m = {},     max = -1,     result = null;     for (let char of str) {     m[char] = m[char] + 1 || 1;   }     for (let [key, count] of Object.entries(m)) {     max = Math.max(max, count);     if (max === count) {       result = key;     }   }     return result; }   module.exports = maxChar;

　　

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const maxChar = require('./index');   test('maxChar function exists', () => {   expect(typeof maxChar).toEqual('function'); });   test('Finds the most frequently used char', () => {   expect(maxChar('a')).toEqual('a');   expect(maxChar('abcdefghijklmnaaaaa')).toEqual('a'); });   test('Works with numbers in the string', () => {   expect(maxChar('ab1c1d1e1f1g1')).toEqual('1'); });