isEmpty

Checks if a string is empty (null, undefined, or "").

isEmpty

Signature

function isEmpty(str: string | null | undefined): boolean

Parameters

• str - The value to check

Returns

true if the string is empty, false otherwise.

Examples

import { isEmpty } from 'strio'

// Empty string
isEmpty('')
// true

// Null and undefined
isEmpty(null)
// true

isEmpty(undefined)
// true

// Non-empty strings
isEmpty('hello')
// false

isEmpty(' ')
// false (whitespace counts as content)

isEmpty('0')
// false (zero string is not empty)

// Numbers and other types
isEmpty(0 as any)
// false

isEmpty(false as any)
// false

Use Cases

import { isEmpty } from 'strio'

// Form validation
function validateRequired(value: string): boolean {
  return !isEmpty(value)
}

// Conditional rendering
if (!isEmpty(user.bio)) {
  renderBio(user.bio)
}

// Default values
const displayName = isEmpty(name) ? 'Anonymous' : name

Related Functions

• isBlank - Check if empty or whitespace
• isString - Check if value is string
• trim - Remove whitespace

See Also

• String Validation Guide
• API Reference