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| 1 | +// Palindrome |
| 2 | +// Write a function that takes in a string that ignores special character and underscores, is case insensitive, ignores spaces, and test if it is a palindrome |
| 3 | + |
| 4 | +const isPalindrome = str => { |
| 5 | + const forwardStr = str |
| 6 | + .toLowerCase() |
| 7 | + .split('') |
| 8 | + .filter(el => { |
| 9 | + return 'abcdefghijklmnopqrstuvwxyz'.includes(el) |
| 10 | + }) |
| 11 | + .join('') |
| 12 | + const reverseStr = forwardStr |
| 13 | + .split('') |
| 14 | + .reverse() |
| 15 | + .join('') |
| 16 | + |
| 17 | + return forwardStr === reverseStr |
| 18 | +} |
| 19 | + |
| 20 | +console.log(isPalindrome('tacocat')) |
| 21 | +console.log(isPalindrome('A man, a plan, a canal. Panama')) |
| 22 | +console.log(isPalindrome('My age is 0, 0 si ega ym.')) |
| 23 | +console.log(isPalindrome('.0_0 (:/-:) 0-0')) |
| 24 | +console.log(isPalindrome('Not a palindrome')) |
| 25 | + |
| 26 | +// |
| 27 | +// |
| 28 | +// or using a regular expression |
| 29 | +const isPalindromeRegex = str => { |
| 30 | + const forwardStr = str.toLowerCase().replace(/[\W_]/g, '') |
| 31 | + const reverseStr = forwardStr |
| 32 | + .split('') |
| 33 | + .reverse() |
| 34 | + .join('') |
| 35 | + |
| 36 | + return forwardStr === reverseStr |
| 37 | +} |
| 38 | + |
| 39 | +console.log(isPalindromeRegex('tacocat')) |
| 40 | +console.log(isPalindromeRegex('A man, a plan, a canal. Panama')) |
| 41 | +console.log(isPalindromeRegex('My age is 0, 0 si ega ym.')) |
| 42 | +console.log(isPalindromeRegex('.0_0 (:/-:) 0-0')) |
| 43 | +console.log(isPalindromeRegex('Not a palindrome')) |
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