array_first_item.js

function test(array) {
    return Array.isArray(array) ? array.shift() : undefined
}

console.log(test([1]));
console.log("" + test([1]));
console.log(test([1, 2, 3]));
console.log("" + test([1, 2, 3]));
console.log(test([]));
console.log("" + test([]));
console.log(test(undefined));



// 1
// 1
// 1
// 1
// undefined
// undefined
// undefined
// 
// *** time: 0.19983 ***