IssueHuntsindresorhus/eslint-plugin-unicorn
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`prefer-includes` rule #8
sindresorhus posted onGitHub
Prefer .includes() over .indexOf() when checking for existence. Since ESLint has no type analysis we'll have to assume all properties named .indexOf() have a .includes() counterpart. This is luckily true for all builtins: String#includes, Array#includes, TypedArray#includes, Buffer#includes.
See https://github.com/eslint/eslint/issues/4209 for more.
.includes() cases:
'foobar'.indexOf('foo') !== -1'foobar'.indexOf('foo') != -1'foobar'.indexOf('foo') > -1'foobar'.indexOf('foo') >= 0
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Add `prefer-includes` rule #214submitted byprbart(20)
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