'use strict';

function updateFruitsCollection (fruits, fruit) {
    if (fruits.indexOf(fruit) === -1) {
    	fruits.push(fruit);
     	console.log('New fruits collection is : ' + fruits);
    } else if (fruits.indexOf(fruit) > -1) {
        console.log('Fruit already exist in the fruits collection');
    }
}

var fruits = ['strawberries', 'kiwi', 'guava', 'avocado'];

updateFruitsCollection(fruits, 'banana'); // New fruits collection is : strawberries,kiwi,guava,avocado,banana
updateFruitsCollection(fruits, 'kiwi'); // Fruit already exist in the fruits collection