Remove Objects From Array Based On Keys & Properties In Another Object?

I have the following object, where the property key is set to a username and the property value is set to a count of the number of times they appear, and an array containing a list

Solution 1:

I've tried varies permutations and loops of .filter and .splice, but with no success.

You will only need filter:

return siteUsers.filter(function(obj) {
    var user = obj.UserName;
    return !(user in peopleWhoAppear && peopleWhoAppear[user] == count);
});

This will get you a new array, with all the users that did not appear in peoplWhoAppear or had the wrong count in there.

Solution 2:

Filter() doesn't change the array, it returns a new one. If you want to iteratively filter the array, you have to set it to the return value of filter() each time.

// copy the arrayvar newSiteUsers = siteUsers.slice(0)  

for (varUserNamein peopleWhoAppear) {
   if (peopleWhoAppear[UserName ] === count) {
                newSiteUsers = newSiteUsers.filter(function (person) {
                    console.log(person);
                    return person.UserName !== UserName;
                }));
     }
 }

console.log(newSiteUsers);