your example doesn't work

[someone235]

When I write this code:

var filter = require("filter-values");

const x = filter({a: 'a', b: 'b', c: 'c'}, function(value, key, obj) {
  return key !== 'b';
});

console.log(x.b);

The output I get is: "b". I would expect it to be undefined. I guess this is because you call isMatch(val), and you don't include the key in the callback arguments.

[doowb]

Looks like a bug was introduced in #2 (I believe that the key and obj should also be passed in).

If you'd like to do a PR to fix this, that'd be great!