26 lines
745 B
Markdown
26 lines
745 B
Markdown
---
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title: Palindrome
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tags: string
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expertise: intermediate
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cover: blog_images/bridge-drop.jpg
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firstSeen: 2017-12-17T16:41:31+02:00
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lastUpdated: 2020-10-22T20:24:04+03:00
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---
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Checks if the given string is a palindrome.
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- Normalize the string to `String.prototype.toLowerCase()` and use `String.prototype.replace()` to remove non-alphanumeric characters from it.
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- Use the spread operator (`...`) to split the normalized string into individual characters.
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- Use `Array.prototype.reverse()`, `Array.prototype.join()` and compare the result to the normalized string.
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```js
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const palindrome = str => {
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const s = str.toLowerCase().replace(/[\W_]/g, '');
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return s === [...s].reverse().join('');
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};
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```
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```js
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palindrome('taco cat'); // true
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```
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