JavaScript Primitive Types

In JavaScript, primitive types are the basic building blocks of the language. They represent single values and are immutable. Here are the six primary primitive types:

1. String

• Represents textual data.
• Enclosed in single quotes ('), double quotes ("), or backticks (`).
• Example:

  let name = "John";
  

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2. Number

• Represents both integer and floating-point numbers.
• Example:

  let age = 25;
  let price = 99.99;
  

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3. Boolean

• Represents a logical entity with two values: true or false.
• Example:

  let isAvailable = true;
  

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4. Undefined

• A variable that has been declared but not assigned a value.
• Example:

  let x;
  console.log(x); // undefined
  

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5. Null

• Represents the intentional absence of any object value.
• Example:

  let y = null;
  

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6. Symbol

• Represents a unique and immutable identifier.
• Example:

  let sym = Symbol('unique');
  

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7. BigInt

• Represents numbers larger than the Number type can safely handle.
• Example:

  let bigIntValue = 1234567890123456789012345678901234567890n;
  

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Characteristics of Primitive Types:

• Immutable: Their values cannot be changed once created. Operations on primitive values return new values.
• Stored by Value: When assigned or passed, they are copied.

Understanding these primitive types is crucial as they form the foundation for working with data in JavaScript.