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[Javascript] string, toUpperCase, toLowerCase, chartAt, at, indexOf, lastIndexOf, includes, startsWith,endsWith, search,substring, slice, split, trim,trimStart,trimEnd,repeat,replace,replaceAll웹/JavaScript 2023. 1. 12. 11:36
I. 생성자 함수 const strObj1 = new String(); const strObj2 = new String('Hello World!'); console.log(strObj1); console.log(strObj2); console.log(strObj1.valueOf(), strObj1.toString()); console.log(strObj2.valueOf(), strObj2.toString()); 콘솔에서 펼쳐서 프로퍼티들을 확인해 볼 것 [[PrimitiveValue]] 비교해 볼 것 valueOf 또는 toString 메서드로 문자열 원시값 반환 const fromNum = new String(123); const fromBool = new String(true); const fro..