var maps=[1,2,3,4,5].map(function(n){return n*2;}); console.log(maps); var filters=[1,2,3,4,5,6,7].filter(function(n){return n%2 == 0;}); console.log(filters); var reduce=[1,2,3,4,5,6,7].reduce(function(accumulator,n){return n+accumulator;}); console.log(reduce);