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์ ์ฒด๋ณด๊ธฐ (161)object(5)array(4)Map(4)์ฌ๊ทํจ์(4)asynchronous(3)class(3)inheritance(3)API(3)git(3)๊น์ด์ฐ์ ํ์(DFS)(3)variable(3)promise(3)Event(3)JOIN(3)filter(3)IIFE(2)parseInt(2)callback Hell(2)split()(2)async(2)reverse(2)position(2)return(2)์๊ณ ๋ฆฌ์ฆ(2)Fetch(2)find(2)function(2)Sort(2)Defer(2)fill(2)isNaN(2)Object Oriented Programming(2)setInterval(2)slice(2)setTimeout(2)JSON.parse(2)Conditionals(2)canvas(2)Custom Hooks(2)์ธ์ฆ(2)Math.random(2)arrow function(2)private field(2)Prototype(2)encapsulation(2)reduce(2)optional chaining(2)๋น
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(1)speechSynthesis(1)recursion(1)navigator(1)for..of(1)flatmap(1)์๊ฐ๋ณต์ก๋(1)์ ๋ ฌ ์๊ณ ๋ฆฌ์ฆ(1)localScope(1)ARC(1)React(1)Math.round(1)instanceof(1)isFinite(1)box tag(1)Module(1)router(1)OR assignment operator(1)ScrollHeight(1)capturing(1)๊ณต๊ฐ๋ณต์ก๋(1)item(1)Object.assign(1)Document(1)๋น๋์ ์ธ๊ธฐ(1)await(1)์ด์งํธ๋ฆฌ(1)useEffect(1)event loop(1)looping objects(1)searchParams(1)Side Effect(1)fixed(1)intersection observer api(1)parseFloat(1)node.js(1)parameter(1)while(1)๋ค์คํํฐ(1)Math Module(1)perspective(1)Flex(1)JavaScript(1)useParams(1)function declaration(1)Higher-order Function(1)UI(1)abstraction(1)Intl(1)method(1)main(1)Flexbox(1)layout(1)Object.create(1)selector(1)keyframes(1)hoisting(1)isInteger(1)...arr(1)AJAX calls(1)prototype chain(1)classList(1)Math.PI(1)์ฟผ๋ฆฌ์คํธ๋ง(1)template literals(1)json(1)assignment operators(1)concat(1)const(1)let(1)cross axis(1)replace(1)static properties(1)์๋งจํฑ ์น(1)AND assignment operator(1)object literal(1)list-style-type(1)Rest parameters(1)fillStyle(1)object constructor(1)loop(1)getElementById(1)๊ฐ์ค์น ๋ฐฉํฅ๊ทธ๋ํ(1)carriage return(1)looping arrays(1)String(1)constructor function(1)key(1)clientHeight(1)commit(1)context(1)์ด๋ถ๊ฒ์(1)Shorthand property names(1)nullish assignment operator(1)for..in(1)jquery(1)๊ฐ๋ฐ์ผ๊ธฐ(1)closePath(1)๋ฐฉํฅ ๊ทธ๋ํ(1)State(1)inline block(1)hider-order function(1)this(1)self(1)๋ฉํ ํ๊ทธ(1)tofixed(1)์ ์ธ(declaration)(1)offsetHeight(1)Sass(1)Chaining(1)@property(1)React-slick(1)script(1)nullish coalescing operator(1)MediaQuery(1)apply method(1)splice(1)static method(1)preventDefault(1)Date object(1)git rabase(1)์ธ์ ๊ทธ๋ํ(1)Letter Spacing(1)block(1)function expression(1)execution context(1)inline(1)console(1)Ternary operator(1)Scope Chain(1)item tag(1)bind method(1)after(1)appendChild(1)framwork(1)๋ฌด๋ฐฉํฅ ๊ทธ๋ํ(1)addEventListener(1)Flat(1)geolocation(1)short-circuiting(1)display(1)computed properties(1)github(1)parameters(1)JSX(1)toggle(1)๊ทธ๋ฆฌ๋ ์๊ณ ๋ฆฌ์ฆ(1)text-transform(1)event delegation(1)useNavigate(1)svg(1)asynchoronous callback(1)call method(1)๊ทธ๋ํ(1)speechSynthesisUtterance(1)์กฐํฉ์๊ณ ๋ฆฌ์ฆ(1)Props(1)์ ํ์(selector)(1)CreateElement(1)if(1)remainder operator(1)synchoronous callback(1)Date(1)BigInt(1)bubbling(1)grid(1)getVoice(1)์์ฝ๋(1)WeCode(1)๋์ด์ฐ์ ํ์(1)๊ฒฐ์ ์๊ณ ๋ฆฌ์ฆ(1)closure(1)private method(1)์ ๋๊ฒฝ๋ก(1)์๋๊ฒฝ๋ก(1)padStart()(1)3D(1)getters and setters(1)promise.all(1)set(1)transform-style(1)nullish operator(1)Stateless(1)new line(1)beginPath(1)property value shorthand(1)container(1)scope(1)in operator(1)for loop(1)webspeech API(1)animation(1)tag(1)argument(1)Promise Chaining(1)public field(1)console API(1)fillText(1)insertAdjacentHTML(1)destructuring assignment(1)setters and getters(1)scroll event(1)aside(1)refactoring(1)substring(1)ํด๋ก ์ฝ๋ฉ(1)DOM traversing(1)getContext(1)every(1)
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[JS] array methods, at method, forEach, forEach with maps and sets
๊ธฐ์กด์ array๊ฐ ๋ฐ๋์ง๋ ์์.array์ shallow copy ๋ฅผ ์ํด ์์ ๋ ๋ฐฉ๋ฒ ์๋ฌด๊ฑฐ๋ ์จ๋ ์๊ด์์!๊ธฐ์กด์ array๋ฅผ ๋ฐ๊พผ๋ค. ๊ธฐ์กด์ array์ item์ ์ญ์ ํ๊ณ ์ถ์ ๋ ์ฌ์ฉ๊ฐ๋ฅ.๊ธฐ์กด์ array ๋ํ ๋ฐ๋๋ค.๊ธฐ์กด์ array ๋ฐ๊พธ์ง ์๋๋ค.๊ธฐ์กด
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๋ฐฐ์ด์ ๋ฌธ์์ด์ ํํ๋ก ๋ฐ๊พธ์ด์ค๋ค. join(','), join('/') ์ด๋ฐ์์ผ๋ก ๊ตฌ๋ณ์๋ฅผ ๋ฃ์ด์ ๋ฐฐ์ด ๋ด์ item๋ค ๊ตฌ๋ณํด์ค ์ ์๋ค. ๊ธฐ๋ณธ๊ฐ์ ,(comma)Q1. make a string out of an arrayString ๊ฐ์ฒด๋ฅผ ์ง์ ํ ๊ตฌ๋ถ์๋ฅผ ์ด์ฉํ์ฌ
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