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find() and findIndex()

find() & findIndex()

Introduction

find() returns the first element that passes a test. findIndex() returns the index of the first passing element.

Examples

const numbers = [5, 12, 8, 130, 44];

numbers.find(x => x > 10);      // 12
numbers.findIndex(x => x > 10); // 1
numbers.find(x => x > 200);     // undefined

Objects

const users = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie' }
];

users.find(user => user.id === 2);
// { id: 2, name: 'Bob' }

Summary

find — returns first matching element (or undefined)
findIndex — returns index of first match (or -1)
Stops searching after first match (efficient)

Further Reading

MDN: Array.prototype.find()