Description

Prevent returning or assigning mutating array methods, to improve readability and also protect against accidentally mutating an array in-place when you shouldn't. Array#sort(), Array#fill(), Array#reverse().

Fail

console.log(foo.sort());

const sorted = foo.sort();

Pass

foo.sort();
console.log(foo);

foo.sort();

I guess we should also allow the case where there's an intermediate array?

const sorted = foo.map(…).sort();