padStart() / padEnd()

문자열 메서드 : padStart() / padEnd()

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

const str1 = "456";

const currentStr1 = str1.padStart(1, "0");      //456
const currentStr2 = str1.padStart(2, "0");      //456
const currentStr3 = str1.padStart(3, "0");      //456
const currentStr4 = str1.padStart(4, "0");      //0456
const currentStr5 = str1.padStart(5, "0");      //00456
const currentStr6 = str1.padStart(6, "0");      //000456
const currentStr7 = str1.padStart(6, "1");      //111456
const currentStr8 = str1.padStart(6, "12");     //121456
const currentStr9 = str1.padStart(6, "123");        //123456
const currentStr10 = str1.padStart(6, "1234");      //123456
const currentStr11 = str1.padStart(6);      //   456

const currentStr12 = str1.padEnd(1, "0");       //456
const currentStr13 = str1.padEnd(2, "0");       //456
const currentStr14 = str1.padEnd(3, "0");       //456
const currentStr15 = str1.padEnd(4, "0");       //4560
const currentStr16 = str1.padEnd(5, "0");       //45600
const currentStr17 = str1.padEnd(6, "0");       //456000
const currentStr18 = str1.padEnd(6, "1");       //456111
const currentStr19 = str1.padEnd(6, "12");      //456121
const currentStr20 = str1.padEnd(6, "123");     //456123
const currentStr21 = str1.padEnd(6, "1234");        //456123
const currentStr22 = str1.padEnd(6);        //456___

padStart() 예제

'abc'.padStart(10);         // "       abc"
'abc'.padStart(10, "foo");  // "foofoofabc"
'abc'.padStart(6,"123465"); // "123abc"
'abc'.padStart(8, "0");     // "00000abc"
'abc'.padStart(1);          // "abc"