prefer-is-nil.md

Prefer _.isNil

When checking that a value is undefined or null (but not false or ''), it is more concise to use _.isNil instead.

Rule Details

This rule takes no arguments.

The following patterns are considered warnings:

var t = !_.isNull(x) && !_.isUndefined(x);

var t = x === undefined || x === null;

The following patterns are not considered warnings:

var t = _.isNil(x);

var t = _.isUndefined(x) || _.isNull(y);

When Not To Use It

This rule is only relevant for Lodash 4. If you don't use Lodash 4, you should not use this rule.

If you do not want to enforce using _.isNil, and prefer using specific checks instead.