How to use 'js max string length' in JavaScript

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47function maxSubstringLength(currentMax, obj) {
48 var ret;
49 if (typeof (obj) === 'string') {
50 ret = Math.max(currentMax, maxSubstringLengthStr(obj));
51 }
52 else if (typeof (obj) === 'object') {
53 ret = Object.keys(obj)
54 .map(function (k) {
55 return Math.max(maxSubstringLengthStr(k), maxSubstringLength(currentMax, obj[k]));
56 })
57 .reduce(function (p, c) { return Math.max(p, c); }, currentMax);
58 }
59 else {
60 ret = currentMax;
61 }
62 return ret;
63}
8function maxChar(str) {
9
10 const charMap = {};
11 let result = '';
12
13 for (let i = 0; i < str.length; i++) {
14
15 const char = str[i];
16
17 charMap[char] = (charMap[char] || 0) + 1;
18
19 if (result === '' || charMap[char] > charMap[result]) {
20 result = char;
21 }
22 }
23
24 return result;
25}

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