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React 9

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    [๋ชฉ์ฐจ](/2019/08/13/reactjs-interview-questions/) ```toc tight: true, from-heading: 2 to-heading: 3 ``` ## Core React ### What is React ๋ฆฌ์•กํŠธ๋Š” ์˜คํ”ˆ์†Œ์Šค ํ”„๋ก ํŠธ์—”๋“œ ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋กœ, ํŠนํžˆ ์‹ฑ๊ธ€ ํŽ˜์ด์ง€ ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜์˜ ์‚ฌ์šฉ์ž ์ธํ„ฐํŽ˜์ด์Šค ๊ตฌ์ถ•์„...
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    ### useReducer ```javascript const [state, dispatch] = useReducer(reducer, initialArg, init); ``` `useState`์˜ ๋Œ€์ฒด ํ•จ์ˆ˜๋‹ค. ๋‹ค์ˆ˜์˜ ํ•˜์œ— ๊ฐ’์„ ๋งŒ๋“œ๋Š” ๋ณต์žกํ•œ ๋กœ์ง, ํ˜น์€ ๋‹ค์Œ state๊ฐ€ ์ด์ „ state์˜ ์˜์กด์ ์ธ ๊ฒฝ์šฐ์— ์“ด๋‹ค. ๋ญ๊ฐ€ ๋ญ”์ง€ ๋ชจ๋ฅด๊ฒ ์œผ๋‹ˆ๊นŒ ์˜ˆ์ œ๋ฅผ ๋ณด์ž. ...
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    # Hooks API Hook์€ react 16.8์—์„œ ์ถ”๊ฐ€๋œ ๊ฐœ๋…์œผ๋กœ, Hook์„ ์‹œ์šฉํ•˜๋ฉด class๋ฅผ ๊ฐ–์„ฑํ•˜์ง€ ์•Š์•„๋„ state๊ด€๋ฆฌ์™€ ๊ฐ™์€ react์˜ ๊ธฐ๋Šฅ์„ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค. ## ๊ธฐ๋ณธ Hook ### useState ```javascript const [state, setState] = useState(initialState); setStat...