includes( )

includes( )

배열이 특정 요소를 포함하고 있는지 판별하고 참과 거짓으로 반환합니다.

"문자열".includes(검색값)
"문자열".includes(검색값, 시작값)

const str1 = "javascript reference";

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