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Underscore


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ํŒŒ๋ผ๋ฏธํ„ฐ(ํ•จ์ˆ˜ ๋งค๊ฐœ๋ณ€์ˆ˜)์— underscore ์˜๋ฏธ


const fun = _ => console.log('Hello, world!')
const fun = () => console.log('Hello, world!')
fun()
arr.forEach(function (_, i) {...})