no-extra-boolean-cast
Recommended
Disallows unnecessary boolean casts
Disallows unnecessary boolean casts
In certain contexts, such as if
, while
or for
statements, expressions are
automatically coerced into a boolean. Therefore, techniques such as double
negation (!!foo
) or casting (Boolean(foo)
) are unnecessary and produce the
same result as without the negation or casting.
Invalid:
if (!!foo) {}
if (Boolean(foo)) {}
while (!!foo) {}
for (; Boolean(foo);) {}
Valid:
if (foo) {}
while (foo) {}
for (; foo;) {}