[프로그래머스] Lv.0 - 배열 두 배 만들기 (javascript)

https://school.programmers.co.kr/learn/courses/30/lessons/120809

프로그래머스

 

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map()

function solution(numbers) {
    return numbers.map(number => number * 2)
}

 

for문

function solution(numbers) {
    const newArr = []
    for(let i = 0; i < numbers.length; i++) {
        newArr.push(numbers[i] * 2)
    }
    return newArr
}