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Array Basics

8 exercisesEasy

Arrays keep an ordered collection of related values under one name. Each item has a zero-based index, so the first item is at position 0, and .length reports how many items the array contains.

const destinations = ["Malmö", "Oslo", "Tallinn"];

console.log(destinations[0]);              // Malmö
console.log(destinations.length);          // 3
console.log(destinations.at(-1));          // Tallinn

Start by creating arrays, reading specific positions, and connecting indexes with length. Once those ideas are solid, changing and looping through collections becomes much easier to reason about.

Create an ArrayStart Read the First ItemStart Read an Item by IndexStart Use Array LengthStart Read the Last ItemStart Recognize an Out-of-Range IndexStart Return an ArrayStart Class ListStart

Next CategoryChanging Arrays