Found unnecessary boolean casts JS-0012
Bug risk
2 months ago
—
3 months old
No results found
That’s all we can say right now.
Description
In contexts such as an if statement's test where the result of the expression will already be coerced to a Boolean, casting to a Boolean via double negation (!!) or a Boolean call is unnecessary.
Bad Practice
const cond = !!!isPresent;
const cond2 = Boolean(!!isPresent);
if (!!cond) {
// ...
}
if (Boolean(cond2)) {
// ...
}
while (!!cond3) {
// ...
}
do {
// ...
} while (Boolean(cond));
for (; !!cond; ) {
// ...
}
Recommended
const cond = !!isPresent;
const cond2 = Boolean(isPresent);
function checkCond() {
return !!isPresent;
}
const cond3 = !!(isPresent ? flag : flag2);