prefer-array-some.md

Pattern: Existence check using find, findIndex, or filter

Issue: -

Description

Using Array#some() is more idiomatic for checking if elements exist in an array that match a condition, compared to find, findIndex, findLast, findLastIndex or checking filter length.

Examples

Example of incorrect code:

const foo = array.find(fn) ? bar : baz;
const foo = array.findLast((elem) => hasRole(elem)) !== null;
foo.findIndex(bar) < 0;
foo.findIndex((element) => element.bar === 1) !== -1;
array.filter(fn).length === 0;

Example of correct code:

const foo = array.some(fn) ? bar : baz;
foo.some((element) => element.bar === 1);
!array.some(fn);