prefer-some.md

Prefer _.some

When comparing the index of an item with an findIndex method, it can be more expressive to use _.some, when only the sole existence of a matching item is taken into account.

Rule Details

This rule takes one argument - an options object, with the property includeNative. If true, the rule will report on all findIndex, and if false, it will only report on _.indexOf calls.

The following patterns are considered warnings:

var a = _.findIndex(b, f) === -1

var a = _.findIndex(b, f) >= 0

/*eslint lodash/prefer-some: [2, {"includeNative": true}]*/
if (a.findIndex(f) === -1) {
 // ...
}

The following patterns are not considered warnings:

x = _.findIndex(a, f);

_.findIndex(a, f) === 2;

if (_.some(a, f)) {
 // ...
}

When Not To Use It

If you do not want to enforce using _.findIndex, you should not use this rule.