78 lines
1.8 KiB
Swift
78 lines
1.8 KiB
Swift
//: [<< Previous](@previous) - [Index](Index)
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import RxSwift
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/*:
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## Mathematical and Aggregate Operators
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Operators that operate on the entire sequence of items emitted by an Observable
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*/
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/*:
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### `concat`
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Emit the emissions from two or more Observables without interleaving them.
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[More info in reactive.io website]( http://reactivex.io/documentation/operators/concat.html )
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*/
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example("concat") {
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let var1 = BehaviorSubject(value: 0)
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let var2 = BehaviorSubject(value: 200)
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// var3 is like an Observable<Observable<Int>>
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let var3 = BehaviorSubject(value: var1)
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let d = var3
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.concat()
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.subscribe {
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print($0)
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}
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var1.on(.Next(1))
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var1.on(.Next(2))
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var1.on(.Next(3))
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var1.on(.Next(4))
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var3.on(.Next(var2))
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var2.on(.Next(201))
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var1.on(.Next(5))
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var1.on(.Next(6))
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var1.on(.Next(7))
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var1.on(.Completed)
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var2.on(.Next(202))
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var2.on(.Next(203))
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var2.on(.Next(204))
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}
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/*:
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### `reduce`
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Apply a function to each item emitted by an Observable, sequentially, and emit the final value.
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This function will perform a function on each element in the sequence until it is completed, then send a message with the aggregate value. It works much like the Swift `reduce` function works on sequences.
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[More info in reactive.io website]( http://reactivex.io/documentation/operators/reduce.html )
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*/
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example("reduce") {
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_ = sequenceOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
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.reduce(0, +)
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.subscribe {
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print($0)
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}
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}
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//: [Index](Index) - [Next >>](@next)
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