javascript remove item from array, if an item already existing in array

Question

following adds items to array:

var arrayOptions = [];

function AddToFilterOptionList(mode) {
    arrayOptions.push(mode);
    }

remove item fr

Answer 1

You need to split by + characted and then loop over produced array to add/remove all items:

var arrayOptions = [];

function AddToFilterOptionList(mode) {
    mode.split(/\+/g).forEach(function(el) {
        var index = arrayOptions.indexOf(el);
        if (index !== -1) {
            arrayOptions.splice(index, 1);
        }
        else {
            arrayOptions.push(el);
        }
    });
}

function RemoveFromFilterOptionList(mode) {
    var index = arrayOptions.indexOf(mode);
    if (index !== -1) {
        arrayOptions.splice(index, 1);
    }
}

AddToFilterOptionList('APPLE');
document.write('
' + arrayOptions); // expect: APPLE

AddToFilterOptionList('APPLE+FRUIT');
document.write('
' + arrayOptions); // expect: FRUIT

AddToFilterOptionList('APPLE+FRUIT+CARROT');
document.write('
' + arrayOptions); // expect: APPLE,CARROT