isUpperCase

Checks if a string is in uppercase.

isUpperCase

Signature

function isUpperCase(str: string): boolean

Parameters

• str - The string to check

Returns

true if all letters are uppercase, false otherwise.

Examples

import { isUpperCase } from 'strio'

// Uppercase
isUpperCase('HELLO')
// true

isUpperCase('HELLO123')
// true

isUpperCase('A')
// true

// Not uppercase
isUpperCase('Hello')
// false

isUpperCase('hello')
// false

isUpperCase('HeLLo')
// false

// No letters
isUpperCase('123')
// false

isUpperCase('!@#')
// false

isUpperCase('')
// false

Use Cases

import { isUpperCase } from 'strio'

// Constant name validation
function isValidConstantName(name: string): boolean {
  return isUpperCase(name.replace(/_/g, ''))
}

isValidConstantName('MAX_VALUE')
// true

// Detect shouting
function isShouting(text: string): boolean {
  const letters = text.replace(/[^a-zA-Z]/g, '')
  return letters.length > 0 && isUpperCase(letters)
}

isShouting('HELLO!!!')
// true

Related Functions

• isLowerCase - Check if lowercase
• capitalize - Capitalize first letter
• underscore - Convert to snake_case

See Also

• String Validation Guide
• API Reference