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

UPDATE:

function add (array, fruits) {
  var firstFruit = fruits.split('+')[0]
  var secondFruit = fruits.split('+')[1]
  var found = false
  var output = []

  output = array.map(function (item) {
    if (item.indexOf(firstFruit) > -1) {
      found = true
      return fruits
    }
    else return item
  })

  if (! found) {
    array.push(fruits)
  }

  return output
}

var fruits = []
add(fruits, 'APPLE')
fruits = add(fruits, 'APPLE+GRAPE')
console.log(fruits[0]) // 'APPLE+GRAPE'
fruits = add(fruits, 'APPLE')
console.log(fruits[0]) // 'APPLE'