includes()

includes()

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includes()

includes 메서드는 문자열 포함 여부를 검색하며, 불린(true, false)을 반환합니다.
//"문자열".includes(검색값)
//"문자열".includes(검색값, 시작값)

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