Identifiers and Literals

Identifiers and Literals are essential and universal concepts used in programming.

Let's explore what identifiers and literals are, and how they are used.

An identifier is a name used to distinguish variables, functions, objects, and more.

For example, in let appleCount = 5;, appleCount is an identifier.

Identifiers can start with a letter, a dollar sign ($), or an underscore (_).

From the second character onward, numbers can also be included, and keywords like let and const cannot be used as identifiers.

A literal is a fixed value directly embedded in the source code.

Literals are used "as is" when assigned to variables or used in operations.

For example, in let appleCount = 5;, 5 is a literal.

• Numeric literals: 123, 3.14

• String literals: "hello", 'world'

• Boolean literals: true, false

• Object literals: {name: "John", age: 30}

• Array literals: [1, 2, 3]

• Regular expression literals: /ab+c/

In brief, an identifier is a name for referencing or invoking data or functions, while a literal is a fixed value directly used in the code.