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Welcome to Learn JavaScript!
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An in-depth course on the basics of JavaScript.
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Introduction to JavaScript
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A brief history of JavaScript and an overview of its basic rules.
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Data types and structures
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The basic "primitive" data types of JavaScript.
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Numbers
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Learn how to use JavaScript's number data type.
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Strings
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Learn how to use JavaScript's string data type.
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Booleans
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Learn how to use JavaScript's boolean data type.
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Null and undefined values
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Learn how to use JavaScript's null and undefined data types.
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BigInt
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Learn how to use JavaScript's BigInt data type.
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Symbols
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Learn how to use JavaScript's symbol data type.
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Variables
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Learn how to use JavaScript variables.
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Comparison operators
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Learn how to use comparison operators.
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Control flow
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Learn about JavaScript's control flow.
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Introduction to functions
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An introduction to JavaScript functions.
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Function expressions
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An introduction to JavaScript function expressions.
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The "new" keyword
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Call functions using the `new` keyword to create objects.
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The "return" keyword
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Use the `return` keyword to get more out of your functions.
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The "this" keyword
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Use the `this` keyword to work with the context your function executes in.
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Introduction to objects
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Introduction to JavaScript objects.
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Property accessors
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Learn how to set, alter, and access the properties of an object.
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Prototypal inheritance
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JavaScript objects and prototypal inheritance.
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Property descriptors
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Use property descriptors to configure your JavaScript objects.
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Indexed collections
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Learn how to use indexed collections such as arrays.
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Keyed collections
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Learn how to use keyed collections such as maps and sets.
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Introduction to classes
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Learn how to use classes in JavaScript.
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Extend classes
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The `extends` keyword lets you create subclasses of existing classes.
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Class fields and methods
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Use class fields and methods to add properties to your classes.
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Static initialization blocks
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Use static initialization blocks to set or alter static fields.
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Appendix
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Additional information that might be helpful on your JavaScript journey.
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