编写javascript函数尾部

Question

Write a JavaScript function, tail(anArray, num) that takes 2 arguments, an array and a number. Assume the number is an integer 0 or greater. tail should return a new array containing the first n elements of the input array. The elements should be in the reverse order as in the input array.

Answer 1

array.prototype.splice can be used to get sub-arrays ( mdn ). array.prototype.reverse can be used to reverse arrays ( mdn ).

 let reverse = (arr, n) => { arr.splice(n); return arr.reverse(); }; let x = reverse([1, 2, 3, 4, 4], 3); console.log(x);