padStart( ) / padEnd( )

padStart() / padEnd()

padStart/padEnd() 메서드는 주어진 길이에 맞게 앞/뒤 문자열을 채우고, 새로운 문자열을 반환합니다.

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padStart() / padEnd()

"문자열".padStart(길이)
"문자열".padStart(길이, 문자열)

padEnd()의 사용법은 padStart()와 동일 합니다.

const str1 = "456";
const currnetStr1 = str1.padStart(1, "0");          //456
const currnetStr2 = str1.padStart(2, "0");          //456
const currnetStr3 = str1.padStart(3, "0");          //456
const currnetStr4 = str1.padStart(4, "0");          //0456
const currnetStr5 = str1.padStart(5, "0");          //00456
const currnetStr6 = str1.padStart(6, "0");          //000456
const currnetStr7 = str1.padStart(6, "1");          //111456
const currnetStr8 = str1.padStart(6, "12");         //121456
const currnetStr9 = str1.padStart(6, "123");        //123456
const currnetStr10 = str1.padStart(6, "1234");      //123456, 자리가 없어서 4는 짤림
const currnetStr11 = str1.padStart(6);              //   456, 앞에는 공백 처리
        
        
const currnetStr12 = str1.padEnd(1, "0");           //456
const currnetStr13 = str1.padEnd(2, "0");           //456
const currnetStr14 = str1.padEnd(3, "0");           //456
const currnetStr15 = str1.padEnd(4, "0");           //4560
const currnetStr16 = str1.padEnd(5, "0");           //45600
const currnetStr17 = str1.padEnd(6, "0");           //456000
const currnetStr18 = str1.padEnd(6, "1");           //456111
const currnetStr19 = str1.padEnd(6, "12");          //456121
const currnetStr20 = str1.padEnd(6, "123");         //456123
const currnetStr21 = str1.padEnd(6, "1234");        //456123
const currnetStr22 = str1.padEnd(6);                //456___, 뒤에 공백 처리