Capitalize first letters
function capitalizeFirst (array) {
// add whatever parameters you deem necessary - good luck!
// var capitalizeFirst = function(array) {
if (array.length === 0) return [];
let chars = array[0].split('');
chars[0] = chars[0].toUpperCase();
return [chars.join('')].concat(capitalizeFirst(array.slice(1)));
}
// }
capitalizeFirst(['car','taco','banana']); // ['Car','Taco','Banana']