includes() 메서드

includes()

includes() 메서드는 문자열 포함 여부를 검색하여, 불린(true,false)을 반환합니다.

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

//11
const str1 = "javascript reference";
const currentStr1 = str1.includes("javascript");            //true
const currentStr2 = str1.includes("j");                     //true
const currentStr3 = str1.includes("b");                     //false
const currentStr4 = str1.includes("reference");             //true
const currentStr5 = str1.includes("reference", 1);          //true
const currentStr6 = str1.includes("reference", 11);         //true
const currentStr7 = str1.includes("reference", 12);         //false