isAlpha

Checks if a string contains only alphabetic characters.

isAlpha

Signature

function isAlpha(str: string): boolean

Parameters

• str - The string to check

Returns

true if the string contains only letters, false otherwise.

Examples

import { isAlpha } from 'strio'

// Letters only
isAlpha('hello')
// true

isAlpha('Hello')
// true

isAlpha('HelloWorld')
// true

// With Cyrillic
isAlpha('привет')
// true

// Not alpha
isAlpha('hello123')
// false

isAlpha('hello world')
// false (space)

isAlpha('hello-world')
// false (hyphen)

isAlpha('')
// false (empty)

isAlpha('123')
// false

Use Cases

import { isAlpha } from 'strio'

// Name validation
function validateName(name: string): boolean {
  return isAlpha(name.replace(/\s/g, '')) // allow spaces
}

// Filter alphabetic input
function filterAlpha(input: string): string {
  return input.split('').filter(char => isAlpha(char)).join('')
}

filterAlpha('abc123xyz')
// "abcxyz"

Related Functions

• isNumeric - Check if numeric
• isAlphaNumeric - Check if alphanumeric
• isString - Check if value is string

See Also

• String Validation Guide
• API Reference