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toUpper()

toUpper(str): string

Converts a string to uppercase.

DEPRECATED

Use string.toUpperCase() directly instead.

Parameters​

str: string | null | undefined​

The string to convert to uppercase.

Returns: string​

The string converted to uppercase.

See Also​

Since​

2.0.0

Also known as​

toUpper (Lodash, es-toolkit, Ramda) · toUpperCase (Remeda, Effect) · ❌ (Radashi, Modern Dash, Antfu)

Example​

// ❌ Deprecated approach
toUpper('hello world'); // => 'HELLO WORLD'

// ✅ Recommended approach
'hello world'.toUpperCase(); // => 'HELLO WORLD'

How it works?​

Converts string to uppercase. Deprecated: Use string.toUpperCase() directly.

Native Equivalent​

// ❌ toUpper('hello')
// ✅ 'hello'.toUpperCase()

Use Cases​

Convert to uppercase 📌​

Convert string to uppercase.

'hello'.toUpperCase();  // 'HELLO'

Format constants​

Format text for display.

const header = title.toUpperCase();