const animals = ['pigs', 'goats', 'sheep'];
console.error('***** adding a single element (cows) at start *****');
const count = animals.unshift('cows');
console.log(animals); // output: Array ["cows", "pigs", "goats", "sheep"]
console.error('***** adding [chickens, cats, dogs] at start *****');
animals.unshift('chickens', 'cats', 'dogs');
console.log(animals); // output: Array ["chickens", "cats", "dogs", "cows", "pigs", "goats", "sheep"]