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Support awaiting optional Promises #49

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WilsonGramer
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This PR adds support for awaiting optional promises, which allows for optional chaining inside an await function, like so:

try await(self.foo?.bar())

If the promise is nil, await immediately returns nil and does nothing more; otherwise it executes the promise as normal and returns an Optional wrapping the awaited value. This is implemented for both Promises and Guarantees.

This should resolve #19 — please let me know what you think, and thank you for providing this library!

This is to allow optional chaining inside an 'await' function, eg:

    try await(self.foo?.bar())

If the promise is 'nil', 'await' immediately returns 'nil' and does
nothing more.
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codecov bot commented Oct 26, 2019

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.64%. Comparing base (743fbf2) to head (d7dbe94).
Report is 1 commits behind head on master.

Files with missing lines Patch % Lines
Sources/AwaitKit/AwaitKit.swift 80.00% 2 Missing ⚠️
Additional details and impacted files
@@             Coverage Diff             @@
##            master      #49      +/-   ##
===========================================
- Coverage   100.00%   97.64%   -2.36%     
===========================================
  Files            4        4              
  Lines           75       85      +10     
===========================================
+ Hits            75       83       +8     
- Misses           0        2       +2     

☔ View full report in Codecov by Sentry.
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@WilsonGramer
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Hey @yannickl, what's the status on this PR? Thanks 😄

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Optional value - Elvis Operator
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