Remove first element from array

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Javascript

jQuery

AngularJs

Hi -

Have what seems to be simple issue. I have a ui-select drop down list. On that is a onChange event method. What I want to happen is when an item is selected and changed I have 3 arrays. One I'm looping through that array to make sure I have types and of those whose type property checked is true I am looping through another array to compare. If I have a match I push that object into the 3rd array. After the loops finish I am trying to remove the first object in the array.

Suggestions -

Thanks
Here is my code

vm.backtypes =[];
vm.types = [];
vm.changeEvent = function(ctrl){
    if(vm.backtypes.length > 0){
        angular.forEach(vm.backtypes, function (x) {
            if(x.checked){;
                angular.forEach(ctrl.backOptionSelected, function(s){
                    if(x.id == s)
                    {
                        vm.types.push(x);
                        //vm.types.shift();

                    }
                });//end 2nd foreach
            }//end if
        });//end first foreach
    }//end if
    vm.types.shift();
    console.log(vm.types);
}//end changeEvent

What I have tried:

I have tried .shift() and I have tried .splice().