I've included some js below.  Grep examples 1 and 2 work.  Grep example 3 does not work.  Any idea why grep example 3 does not work?

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<script src="jquery-3.0.0.min.js"></script>

<script>

$(function(){

var users = 

[{

FirstName: 'John',

LastName: 'Smith'

},

{

FirstName: 'David',

LastName: 'Johnson'

},

{

FirstName: 'Bill',

LastName: 'Jones'

}];

var filteredUsers = 

$.grep(users, function(user, i){

    //1. works

    //return user.LastName == 'Smith'; 

    //2. works

    //return user.LastName != 'Smith'; 

    //3. does not work

    return 

user.LastName != 'Smith' &&

    user.LastName != 'Johnson';

});

});

</script>