Key Concepts

Review core concepts you need to learn to master this subject

Mutable Variables

var age = 25 age = 26

A mutable variable is declared with the var keyword and represents a value that is expected to change throughout a program.

Data Types & Variables
Lesson 1 of 3

What you'll create

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How you'll master it

Stress-test your knowledge with quizzes that help commit syntax to memory

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