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padStart() / padEnd()
padStart()/padEnd() 메서드는 주어진 길이에 맞게 앞/뒤 문자열을 채우고, 새로운 문자열을 반환합니다.
"문자열".padStart(길이)
"문자열".padStart(길이, 문자열)
"문자열".padStart(길이, 문자열)
const str1 = "456";
const currentStr1 = str1.padStart(1, "0");
const currentStr2 = str1.padStart(2, "0");
const currentStr3 = str1.padStart(3, "0");
const currentStr4 = str1.padStart(4, "0");
const currentStr5 = str1.padStart(5, "0");
const currentStr6 = str1.padStart(6, "0");
const currentStr7 = str1.padStart(6, "1");
const currentStr8 = str1.padStart(6, "12");
const currentStr9 = str1.padStart(6, "123");
const currentStr10 = str1.padStart(6, "1234"); //자릿수 안 맞아서 '4'가 잘림
const currentStr11 = str1.padStart(6); //앞에 공백으로 처리
const currentStr12 = str1.padEnd(1, "0");
const currentStr13 = str1.padEnd(2, "0");
const currentStr14 = str1.padEnd(3, "0");
const currentStr15 = str1.padEnd(4, "0");
const currentStr16 = str1.padEnd(5, "0");
const currentStr17 = str1.padEnd(6, "0");
const currentStr18 = str1.padEnd(6, "1");
const currentStr19 = str1.padEnd(6, "12");
const currentStr20 = str1.padEnd(6, "123");
const currentStr21 = str1.padEnd(6, "1234");
const currentStr22 = str1.padEnd(6); //뒤에 공백으로 처리
결과보기
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