how to retrive last four parts of an array code example

Example 1: array cut only last 5 element

arr.slice(Math.max(arr.length - 5, 0))

Example 2: return last two values of array in javascript

var arr1 = [0, 1, 2, 3, 4, 5, 6, 7],
  arr2 = [0, 1, 2, 3];

document.body.innerHTML = 'ARRAY 1: ' + arr1.slice(1).slice(-5) + '<br/>ARRAY 2: ' + arr2.slice(1).slice(-5);