RxSwift: Concat Operator

.concat(_:)

• Chains two or more Observable sequences.
• Concatenates the output of multiple Observables into a single Observable in Observable order.
• First Observable completes followed by the second and so forth.
• If trying to concatenate a “hot” Observable, concat will not see it and will not emit.
• Used as a static function or instance method of an Observable.
• If the inner Observable emits an error, the result Observable emits error and terminates.
• N.B: Observable sequences are strongly typed so you can only concatenate sequences where the elements are the same type.
• If you want to add to the start of an Observable, use the .startWith(_:) operator.

--T------E-----N----------------->
-I--N------A----R----O-------W--->

concat()

--T------E-----N-I-N-A-R-O-W----->

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