8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
18 lines
621 B
Markdown
18 lines
621 B
Markdown
### palindrome
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Returns `true` if the given string is a palindrome, `false` otherwise.
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Convert string `String.toLowerCase()` and use `String.prototype.replace()` to remove non-alphanumeric characters from it.
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Then, use the spread operator (`...`) to split string into individual characters, `Array.prototype.reverse()`, `String.prototype.join('')` and compare to the original, unreversed string, after converting it `String.tolowerCase()`.
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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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