JavaScript Array_basics Guide
Array fundamentals: creation, access, length, and basic operations for ordered collections. The guide walks through Array Operations. Create: `[]`, `new Array()`, `Array.from()`, `Array.of()`. Access: `arr[0]`, `arr.at(-1)` (from end). Length: `arr.length` — settable (truncates). Check: `Array.isArray(arr)`. `arr.fill(val)` — fill all. `arr.copyWithin(target, start)` — copy portion. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.