Key Concepts

Review core concepts you need to learn to master this subject

Property .length

const numbers = [1, 2, 3, 4]; numbers.length // 4

The .length property of a JavaScript array indicates the number of elements the array contains.

Lesson 1 of 4

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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