Programming/JavaScript (65) 썸네일형 리스트형 JavaScript treats variables that are undefined as false. Testing Selections! green에 아무 값이 없거나 (undefined) null값을 넣어주거나 0을 넣어주면 콘솔에 모두 false로 찍힘 False, undefined, null are not a number Arrays https://www.w3schools.com/js/js_array_methods.asp JavaScript Array Methods W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. www.w3schools.com typeof In JavaScript there are 5 different data types that can contain values: string number boolean object function There are 6 types of objects: Object Date Array String Number Boolean And 2 data types that cannot contain values: null undefined The typeof operator returns a string indicating the type of the unevaluated operand. null은 -> object Double Quotes vs. Single Quotes 쌍따옴표와 따옴표 차이 없음 둘다 string.. What is loosely typed in JavaScript? JavaScript is loosely typed. You don't have to tell a string to be a string, and you don't need to require a function to accept an integer as its argument. This provides great flexibility for JavaScript. https://www.tech-wiki.online/en/loosely-strongly-typed.html Loosely typed and strongly typed languages The main difference between using loosely typed languages and strongly typed languages In p.. The plus sign (+) does double duty 1. concatenate 문자를 이어줌 2. add 숫자 더함 이전 1 ··· 4 5 6 7 다음
