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Showing content from https://github.com/ReactiveX/rxjs/issues/6399 below:

Deprecating `MapTo` variants. · Issue #6399 · ReactiveX/rxjs · GitHub

Based off of a comment here

At one point, there was some performance advantage to having mapTo, concatMapTo, switchMapTo, et al. Because they introduced a way to map to the same value over and over again, without introducing a closure.

Now:

  1. Closures are much faster.
  2. Therefor the whole library is written in such a way that is uses closures.

Considering that mergeMapTo(x) and mergeMap(() => x) do pretty much the same thing, only one is hiding the closure, I thikn we should deprecate the MapTo variants to help clean up the core API.

cartant, jakovljevic-mladen, jgbpercy, sod, jrista and 5 moresteve-taylor and oledbben-barbier

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