concat()

concat() 란?

concat()는 둘 이상의 문자열을 결합하여, 새로운 문자열을 반환해주는 메서드입니다.

const str1 = "cat"
const currentStr1 = str1.concat("sleep"); //catsleep
const currentStr2 = str1.concat(" ","sleep"); //cat sleep
const currentStr3 = str1.concat(" ",["so","cute"]); //cat so,cute

"문자열".concat(문자열)
"문자열".concat(문자열,문자열...)

 

    const str1 = "javascript";
    const currentStr1 = str1.concat("reference")         //javascriptreference
    const currentStr2 = str1.concat(" ", "reference")    //javascript reference
    const currentStr3 = str1.concat(",", "reference")    //javascript,reference
    const currentStr4 = str1.concat(", ", "reference", ", " , "book")    //javascript, reference, book
    const currentStr5 = str1.concat(" ",[ "refer", "book"])    //javascript refer,book //배열은 (,)로 나옴