Destruct

const [ head, ...tail ] = [ 1, 2, 3, 4, 5 ];

// const head = ([ head, ...tail ]) => head;
// const tail = ([ head, ...tail ]) => tail;

// console.log( head([1,2,3]) );
// console.log( tail([1,2,3]) );

 console.log(tail);