JavaScript
Arrays & lists
A practical reference with examples you can run.
Introduction
A collection groups related values in a particular order. Indexes start at zero in these languages. Check whether a collection is empty before accessing its first value, and avoid changing its length while iterating unless you intend to.
Syntax & example
const foods = ["pasta", "rice", "soup"]; console.log(foods.at(-1));
Expected output
soup
Common mistakes
- Using a variable before assigning a value to it.
- Mixing text and numbers without converting deliberately.
- Skipping an empty input or a boundary value when testing.
Practice
Create a collection of three favorite foods and display the last one.
main.jsYour ideas, in code.
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