string.toUpperCase

toUpperCase() λ©”μ„œλ“œλŠ” 호좜된 λ¬Έμžμ—΄ 값을 λŒ€λ¬Έμžλ‘œ λ³€ν™˜ν•˜μ—¬ λ°˜ν™˜ν•œλ‹€. (값이 μ•„λ‹Œ 경우 λ¬Έμžμ—΄λ‘œ λ³€ν™˜λ¨)

const sentence = 'The whiskers of a cat are highly sensitive to touch.';
sentence.toUpperCase(); // "THE WHISKERS OF A CAT ARE HIGHLY SENSITIVE TO TOUCH."

Syntax

str.toUpperCase()

Return value

λŒ€λ¬Έμžλ‘œ λ³€ν™˜λœ 호좜 λ¬Έμžμ—΄μ„ λ‚˜νƒ€λ‚΄λŠ” μƒˆ λ¬Έμžμ—΄

Exceptions

TypeError

Function.prototype.call() 을 μ‚¬μš©ν•˜μ—¬ null μ΄λ‚˜ undefined 을 호좜 ν•  λ•Œ

## Description

`toUpperCase()` λ©”μ„œλ“œλŠ” λŒ€λ¬Έμžλ‘œ λ³€ν™˜λœ λ¬Έμžμ—΄ 값을 λ°˜ν™˜ν•œλ‹€. JavaScript λ¬Έμžμ—΄μ€ λ³€κ²½ν•  수 μ—†μœΌλ―€λ‘œ 이 λ©”μ„œλ“œλŠ” λ¬Έμžμ—΄ 자체의 κ°’μ—λŠ” 영ν–₯을 λ―ΈμΉ˜μ§€ μ•ŠλŠ”λ‹€.

## Examples

### κΈ°λ³Έ μ‚¬μš©λ²•

```js
'alphabet'.toUpperCase(); // "ALPHABET"

λ¬Έμžμ—΄μ΄ μ•„λ‹Œ this을 λ¬Έμžμ—΄ λ³€ν™˜

λ¬Έμžμ—΄μ΄ μ•„λ‹Œ 값은 λ¬Έμžμ—΄λ‘œ λ³€ν™˜ν•œλ‹€. this λ¬Έμžμ—΄μ΄ μ•„λ‹ˆλ―€λ‘œ λ¬Έμžμ—΄λ‘œ λ³€ν™˜ν•œλ‹€.

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