The max() operator finds the largest value. This comes in two flavors: we either just call the max() operator with no arguments, or we give it a compare function. The compare function then decides whether something is larger than, smaller than, or equal to an emitted value. Let's have a look at the two different versions:
// mathematical/max.jslet streamWithNumbers$ = Rx.Observable .of(1,2,3,4) .max();// 4streamWithNumbers$.subscribe(data => console.log(data)); function comparePeople(firstPerson, secondPerson) { if (firstPerson.age > secondPerson.age) { return 1; } else if (firstPerson.age < secondPerson.age) { return -1; } return 0;}let streamOfObjects$ = Rx.Observable .of({ name : "Yoda", age: 999 }, { name : "Chris", age: 38 }) ...