메소드 공부

1.템플릿 리터럴 사용하기

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2.split (), fill() , join ()

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3.find()

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4.findIndex()

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5.Array.entries()

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6.includus() 인척 하는 filter()

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7.switch

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8.for in

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9.while vs for of vs for 속도비교

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10.Number.isNaN()

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11.typeof

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12.Array.indexOf()

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13.Array.filter()

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14.Array.map()

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15.Array.reduce()

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16.Array.forEach()

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17.Array.Every()

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18.Array.some()

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19.삼항연산자

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20.substr(), padEnd()

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21.Array.reduce로 객체 만들기

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22.Array.map의 인자를 배열로 주기

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