prefer-reject.md

Prefer reject

When using _.filter with a negative condition, it could improve readability by switching to _.reject

Rule Details

This rule takes one argument, maximum path length (default is 3).

The following patterns are considered warnings:

_.filter(users, function(user) {
  return user.name.givenName !== 'Bob';
});

_.filter(users, function(user) {
  return !user.isSomething;
});

The following patterns are not considered warnings:

_.filter(users, function(user) {
  return !user.active && isSomething;
});

_.filter(users, function(user) {
  return !f(user);     // The function f could take multiple arguments, e.g. parseInt 
}); 

When Not To Use It

If you do not want to enforce using _.reject, you should not use this rule.