→ 중복값 방지 latest랑 같은게 나오면 무시함

example(of: "distinctUntilChanged") {
Observable.of("A","A","B","B","C","D","E")
.distinctUntilChanged()
.subscribe{
print($0)
}
.disposed(by: disposeBag)
}
/*
--- Example of:distinctUntilChanged---
next(A)
next(B)
next(C)
next(D)
next(E)
completed
*/
정수 발음을 문자열로 바꾼다음 한 문자열이 다른 문자열에 속해 있다면 true를 반환하게 설정
(true = emil하지 말라)
example(of: "distinctUntilChaged") {
let formatter = NumberFormatter()
formatter.numberStyle = .spellOut
Observable<NSNumber>.of(10,110,20,200,210,310)
.distinctUntilChanged { a,b in
print("a=\\(formatter.string(from: a)!), b=\\(formatter.string(from: b)!)")
guard let aword = formatter.string(from: a)? .components(separatedBy: " "),
let bword = formatter.string(from: b)?.components(separatedBy: " ")
else {return false}
var containsMatch = false
for aword in aword where bword.contains(aword){
containsMatch = true
break
}
return containsMatch
}.subscribe{
print($0)
}.disposed(by: disposeBag)
}
/*
--- Example of:distinctUntilChaged---
next(10)
a=ten, b=one hundred ten
a=ten, b=twenty
next(20)
a=twenty, b=two hundred
next(200)
a=two hundred, b=two hundred ten
a=two hundred, b=three hundred ten
completed
*/
주어진 시간 후 이벤트 emit
x초 후에 가장 마지막 이벤트 emit

