How to reverse a string in JavaScript
Łukasz Holeczek
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Reversing strings is useful for creating palindrome checks, implementing text effects, processing data transformations, and building features like backward text displays in JavaScript applications.
With over 25 years of experience in software development and as the creator of CoreUI, I’ve implemented string reversal in components like search filters, text animations, and validation systems where character order manipulation enhances functionality.
From my extensive expertise, the most straightforward and readable solution is using the combination of split(), reverse(), and join() methods to convert the string to an array, reverse it, and convert back.
This approach is intuitive, leverages built-in array methods, and provides excellent readability for other developers.
Use split(), reverse(), and join() methods to reverse the character order of a string.
const text = 'hello'
const reversed = text.split('').reverse().join('')
// Result: 'olleh'
This method chains three operations: split('') converts the string into an array of individual characters, reverse() flips the order of elements in the array, and join('') combines the characters back into a string. In this example, 'hello'.split('') creates ['h', 'e', 'l', 'l', 'o'], then reverse() makes it ['o', 'l', 'l', 'e', 'h'], and finally join('') produces 'olleh'. The empty string parameter in split('') and join('') ensures we work with individual characters rather than words.
Best Practice Note:
This is the same approach we use in CoreUI components for implementing text transformation utilities and search functionality across our component library.
For performance with very large strings, consider using a for loop with string concatenation. Be aware that this method doesn’t handle Unicode surrogate pairs correctly; for international text, use Array.from(text).reverse().join('') to properly handle complex characters.
