let numlist = [1,2,3,4,5,6]; let result = Array.from(numlist, x =>x * x); console.log(result); let agelist = [18,18,21,16,28,31,35,38,45,52]; let above30 = agelist.findIndex(x=>x>30); console.log("Total " + above30 + "persons over 30 years old");