reverse

Reverse a string.

reverse

Signature

function reverse(str: string): string

Parameters

• str - The string to reverse

Returns

String with characters in reverse order.

Examples

import { reverse } from 'strio'

// Basic usage
reverse("hello")
// "olleh"

reverse("world")
// "dlrow"

// Numbers
reverse("123")
// "321"

// With spaces
reverse("hello world")
// "dlrow olleh"

// Palindromes
reverse("racecar")
// "racecar"

reverse("level")
// "level"

// Empty string
reverse("")
// ""

// Single character
reverse("a")
// "a"

// Special characters
reverse("hello!")
// "!olleh"

// Unicode
reverse("привет")
// "тевирп"

Use Cases

Check Palindromes

import { reverse } from 'strio'

function isPalindrome(str: string): boolean {
  const cleaned = str.toLowerCase().replace(/[^a-z0-9]/g, '')
  return cleaned === reverse(cleaned)
}

isPalindrome("A man, a plan, a canal: Panama")
// true

isPalindrome("racecar")
// true

isPalindrome("hello")
// false

Reverse Words

import { reverse } from 'strio'

function reverseWords(sentence: string): string {
  return sentence
    .split(' ')
    .map(word => reverse(word))
    .join(' ')
}

reverseWords("Hello World")
// "olleH dlroW"

Reverse Sentence Order

import { reverse } from 'strio'

function reverseSentence(sentence: string): string {
  return sentence
    .split(' ')
    .reverse()
    .join(' ')
}

reverseSentence("Hello World from JavaScript")
// "JavaScript from World Hello"

Create Mirror Text

import { reverse } from 'strio'

function createMirror(text: string): string {
  return `${text} | ${reverse(text)}`
}

createMirror("Hello")
// "Hello | olleH"

Reverse File Extensions

import { reverse } from 'strio'

function reverseExtension(filename: string): string {
  const [name, ext] = filename.split('.')
  return `${name}.${reverse(ext)}`
}

reverseExtension("document.pdf")
// "document.fdp"

Simple Obfuscation

import { reverse } from 'strio'

function simpleObfuscate(text: string): string {
  return btoa(reverse(text))
}

function simpleDeobfuscate(encoded: string): string {
  return reverse(atob(encoded))
}

const obfuscated = simpleObfuscate("secret")
// "dGVyY2Vz"

simpleDeobfuscate(obfuscated)
// "secret"

Reverse Path

import { reverse } from 'strio'

function reversePath(path: string): string {
  return path.split('/').reverse().join('/')
}

reversePath("home/user/documents")
// "documents/user/home"

Character Handling

Works with various character types:

import { reverse } from 'strio'

// ASCII
reverse("ABC123")
// "321CBA"

// Unicode letters
reverse("café")
// "éfac"

// Emojis (may vary)
reverse("Hello 👋")
// "👋 olleH"

// Chinese characters
reverse("你好世界")
// "界世好你"

// Mixed
reverse("Hello123World")
// "dlroW321olleH"

Common Patterns

import { reverse } from 'strio'

// Reverse and lowercase
const str = "HELLO"
reverse(str.toLowerCase())
// "olleh"

// Reverse specific part
const text = "Hello World"
const [first, second] = text.split(' ')
`${first} ${reverse(second)}`
// "Hello dlroW"

// Check if reverse matches
const original = "test"
const reversed = reverse(original)
original === reversed
// false

Limitations

Complex Unicode

import { reverse } from 'strio'

// Combining characters may not reverse correctly
reverse("e\u0301")  // é (e + combining acute)
// May produce unexpected results

// Use with caution on:
// - Combining diacritics
// - Right-to-left scripts
// - Complex emojis

Surrogate Pairs

// Some emojis use surrogate pairs
reverse("👨‍👩‍👧‍👦")  // Family emoji
// May not reverse as expected

Related Functions

• truncate - Shorten strings
• words - Split into words
• capitalize - Capitalize text

See Also

• String Manipulation Guide
• Text Processing