prefer-array-some.md

Prefer .some(…) over .filter(…).length check and .find(…)

Prefer using Array#some over:

• Non-zero length check on the result of Array#filter().
• Using Array#find() to ensure at least one element in the array passes a given check.

This rule is fixable for .filter(…).length check and has a suggestion for .find(…).

Fail

const hasUnicorn = array.filter(element => isUnicorn(element)).length > 0;

const hasUnicorn = array.filter(element => isUnicorn(element)).length != 0;

const hasUnicorn = array.filter(element => isUnicorn(element)).length >= 1;

if (array.find(element => isUnicorn(element))) {
	// …
}

const foo = array.find(element => isUnicorn(element)) ? bar : baz;

Pass

const hasUnicorn = array.some(element => isUnicorn(element));

if (array.some(element => isUnicorn(element))) {
	// …
}

const foo = array.find(element => isUnicorn(element)) || bar;