MODULE 2 · Working with data

Arrays

Arrays

An array is an ordered collection. It is useful when the items share a role, such as tasks, products, or scores.

Learning objectives

• Create and read an array
• Use map without mutating the original array

Group ordered values and use array operations intentionally. Focus on explaining each decision in your own words before relying on a pattern or shortcut.

Example

const prices = [10, 20, 30];
const withTax = prices.map((price) => price * 1.18);
console.log(withTax);

Summary

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