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What is use for ConcatMap and MergeMap in Rx.js?

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What is use for ConcatMap and MergeMap in Rx.js?
posted May 25, 2018 by anonymous

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These both output all values, the difference is the ordering.

mergeMap - Order by inner observable
[0,0],[1,0],[0,1],[2,0],[1,1],[3,0],[2,1],[4,0],[3,1],[4,1]

concatMap - Order by outer observable
[0,0],[0,1],[1,0],[1,1],[2,0],[2,1],[3,0],[3,1],[4,0],[4,1]

From the output, mergeMap outer emit can be delayed in the sequence, but concatMap follows strict outer emit sequence.

Read More here - https://stackoverflow.com/questions/49698640/flatmap-mergemap-switchmap-and-concatmap-in-rxjs

answer May 31, 2018 by Maninder Bath
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