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// Code using identifiers and literals
let myName = 'John'; // Identifier: myName, Literal: 'John'

let myAge = 30; // Identifier: myAge, Literal: 30

const pi = 3.14159; // Identifier: pi, Literal: 3.14159

// Output values
console.log('Name:', myName); // Name: John

console.log('Age:', myAge); // Age: 30

console.log('Pi:', pi); // Pi: 3.14159

# Identifiers and Literals

`Identifier` and `Literal` are important concepts in programming languages, used to name variables, constants, functions, etc., or to represent the values themselves.

<br />

## Identifier

- Definition: An identifier is a name used to distinguish variables, functions, objects, etc.
- Example: In `let appleCount = 5;` `appleCount` is the identifier.
- Rules:
  - An identifier can start with an alphabet, dollar sign (`$`), or underscore (`_`).
  - From the second character, an identifier can also include numbers.
  - Reserved keywords cannot be used as identifiers (e.g., `let`, `if`, etc.).

<br />

## Literal

- Definition: A literal is a fixed value directly written in the source code. Literals are used as they are when assigned to a variable or used in operations.
- Example: In `let appleCount = 5;` `5` is a numeric literal.
- Types:
  - Numeric literals: e.g., `123`, `3.14`
  - String literals: e.g., `"hello"`, `'world'`
  - Boolean literals: e.g., `true`, `false`
  - Object literals: e.g., `{name: "John", age: 30}`
  - Array literals: e.g., `[1, 2, 3]`
  - Regular expression literals: e.g., `/ab+c/`

In short, an identifier is a name used to refer to or call upon data or functions, while a literal is a fixed value used directly in the code.