JavaScript Array_find Guide
Array find methods: find, findIndex, findLast, findLastIndex for locating elements by condition. The guide walks through Array Find Methods. `arr.find(fn)` — first matching element (or undefined). `arr.findIndex(fn)` — index of first match (or -1). `arr.findLast(fn)` — last match. `arr.findLastIndex(fn)` — index of last match. `arr.includes(val)` — boolean check. `arr.some(fn)` — any matches. `arr.every(fn)` — all match. findLast/findLastIndex are ES2023. 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.