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Author: cmcoffeedev

0125-valid-palindrome/0125-valid-palindrome-04-22-2025-01-14-37.js

@@ -0,0 +1,39 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isPalindrome = function(s) {
+    
+    const isAlphaNumeric = (char) => {
+        const charCode = char.charCodeAt(0)
+        return (
+            (charCode <= 90 && charCode >= 65) ||
+            (charCode <= 57 && charCode >= 48)
+        )
+    }
+    
+    const sLower = s.toUpperCase()
+    var left = 0
+    var right = sLower.length-1 
+    
+    while(left < right){
+        const leftChar = sLower.charAt(left)
+        const rightChar = sLower.charAt(right)
+        
+        if(!isAlphaNumeric(leftChar)){
+           left++
+           continue  
+        } 
+        if(!isAlphaNumeric(rightChar)){
+           right--
+           continue  
+        } 
+        
+        if(leftChar != rightChar) return false 
+        
+        left++
+        right--
+    }
+    
+    return true 
+};