JavaScripttunnisteet

JavaScripttunnisteet, often referred to as JavaScript identifiers, are names given to programming entities within JavaScript code. These entities include variables, functions, properties, and labels. When you declare a variable like `let myVariable = 10;`, `myVariable` is a JavaScript identifier. Similarly, when you define a function such as `function greetUser() { ... }`, `greetUser` is also an identifier.

The rules for constructing valid JavaScript identifiers are specific. An identifier must begin with a letter, an underscore (_), or a dollar sign ($). Subsequent characters can be letters, digits (0-9), underscores, or dollar signs. Keywords, which are reserved words with special meaning in JavaScript (like `if`, `else`, `for`, `while`, `function`, `var`, `let`, `const`), cannot be used as identifiers. Identifiers are case-sensitive, meaning `myVariable` is different from `MyVariable`. Following these rules ensures that the JavaScript engine can correctly interpret and process your code. Properly naming identifiers is crucial for code readability and maintainability, making it easier for developers to understand the purpose of different parts of the program.