# no-extra-boolean-cast

Disallow unnecessary boolean casts.

In contexts where expression will be coerced to a Boolean (e.g. if), casting to a boolean (using !! or Boolean(expr)) is unnecessary.

# Invalid Code Examples

if (!!foo) {}
while (!!foo) {}
var foo = !!!bar;
var foo = Boolean(!!bar);

Name	Type	Description
`enforceForLogicalOperands`	bool	If this option is `true`, this rule will also check for unnecessary boolean cast inside logical expression, which is disabled by default.

More incorrect examples

if (!!foo) {}

do {} while (!!foo)

while (!!foo) {}

!!foo ? bar : baz

for (; !!foo;) {}

!!!foo

Boolean(!!foo)

new Boolean(!!foo)

if (Boolean(foo)) {}

do {} while (Boolean(foo))

while (Boolean(foo)) {}

Boolean(foo) ? bar : baz

for (; Boolean(foo);) {}

!Boolean(foo)

!Boolean(foo && bar)

!Boolean(foo + bar)

!Boolean(+foo)

!Boolean(foo())

!Boolean(foo = bar)

!Boolean(...foo);

!Boolean(foo, bar());

!Boolean((foo, bar()));

!Boolean();

!(Boolean());

if (!Boolean()) { foo() }

while (!Boolean()) { foo() }

if (Boolean()) { foo() }

while (Boolean()) { foo() }

Boolean(Boolean(foo))

Boolean(!!foo, bar)

More correct examples

Boolean(bar, !!baz);

var foo = !!bar;

function foo() { return !!bar; }

var foo = bar() ? !!baz : !!bat

for(!!foo;;) {}

for(;; !!foo) {}

var foo = Boolean(bar);

function foo() { return Boolean(bar); }

var foo = bar() ? Boolean(baz) : Boolean(bat)

for(Boolean(foo);;) {}

for(;; Boolean(foo)) {}

if (new Boolean(foo)) {}