JavaScript Every
every() checks whether ALL elements pass the test and returns a boolean. It stops at the first failure. It is the logical mirror of some().
Syntax
arr.every((x) => x > 0)Examples
| Input | Arguments | Output |
|---|---|---|
| [1, 2, 3] | x => x > 0 | true |
| [1, 2, 3] | x => x > 1 | false |
| ↳ One failing element is enough to get false. | ||
When to use it
- Validate that every entry of a form list is filled.
- Check that all numbers are within a range.
Gotchas
- On an empty array every() returns true (vacuous truth). Surprising but logical.
- One failing element is enough to get false.
Try it live
Type your input and see Every transform it instantly.
Want to go further? Chain Every with other functions, pipe one output into the next and watch your data transform in the visual Playground.