padStart() / padEnd()

문자열 객체

padStart() / padEnd()에 대해 알아보는 시간을 가지도록 하겠습니다.

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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)

{
    //09
    {
        //"문자열".padStart(길이)
        //"문자열".padStart(길이, 문자열)
        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___

        console.log(currentStr22)
    }
}