How to use 'longest palindromic substring javascript' in JavaScript

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971function longestCommonPrefix(arr = []) {
972 const cnt = arr.length;
973 if (cnt === 0) return '';
974 if (cnt === 1) return arr[0];
975
976 const first = arr[0];
977 // complexity: O(m * n)
978 for (var m = 0; m < first.length; m++) {
979 const c = first[m];
980 for (var n = 1; n < cnt; n++) {
981 const entry = arr[n];
982 if (m >= entry.length || c !== entry[m]) {
983 return first.substring(0, m);
984 }
985 }
986 }
987 return first;
988}
42function longestCommonPrefix2(strs) {
43 const s = strs[0] || '';
44 let l = strs.length;
45 if (l <= 1) {
46 return s;
47 }
48 let min = Infinity;
49 while (l-- > 1 && min) {
50 min = Math.min(getPrefixLength2(strs[l], strs[l - 1]), min);
51 }
52 return s.substr(0, min);
53}

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