Update 5-longest-palindromic-substring.js

Author: everthis

5-longest-palindromic-substring.js

@@ -1,3 +1,26 @@
+/**
+ * @param {string} s
+ * @return {string}
+ */
+const longestPalindrome = function(s) {
+  let res = ''
+  for(let i = 0, len = s.length; i < len; i++) {
+    let s1 = chk(s,i,i), s2 = chk(s,i,i+1)
+    if(s1.length > res.length) res = s1
+    if(s2.length > res.length) res = s2
+  }
+  return res
+};
+
+function chk(s, i, j) {
+  for(; i>= 0 && j < s.length; i--, j++) {
+    if(s[i] !== s[j]) break
+  }
+  return s.slice(i+1, j)
+}
+
+// another
+
 /**
  * @param {string} s
  * @return {string}