48.reduce sort, go to weight, take maximum value

vararr = [2,4,1,-1,9]//Take maximum valuevarMaxValue = Arr.reduce (function(A, b) {returnA>b?A:B}) Console.trace (' Maxvalue-> ', MaxValue)//array de-weightvarARR1 = [2,3,4,5,6,7,4,6,3]let $arr 1= Arr1.reduce (function(Prev,number) {console.log (prev)if(Prev.indexof (number) ===-1) {Prev.push (number)}returnprev;},[]) Console.trace (' $arr 1-> ', $arr 1)//SortvarARR2 = ["Zebras", "dogs", "elephants", "Penguins"].sort (function(A, b) {returnA.length-b.length;}); Console.log (ARR2)

You can expand to compare the maximum value of an attribute in an array object, and examine an attribute in the array object ... So it's still very powerful.

48.reduce sort, go to weight, take maximum value