feat(presence): implemented presence function

[tauantcamargo]

Implemented presence function.

Issue: #654

[char0n]

Thanks for contributing,It's looking good so far!. The PR must usually come with 5 files modified. You can see an example in this PR. This PR is missing typings and typings tests. Also please have a look at my code review comments.

[tauantcamargo]

@char0n i'll take a look to the requests, thank u by the way.

[codecov]

Codecov Report

Merging #2123 (1810924) into master (6c82686) will not change coverage.
The diff coverage is n/a.

❗ Current head 1810924 differs from pull request most recent head 191baf5. Consider uploading reports for the commit 191baf5 to get more accurate results

@@           Coverage Diff           @@
##           master    #2123   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files         234      234           
  Lines         622      622           
=======================================
  Hits          612      612           
  Misses         10       10           

Flag	Coverage Δ
unittests	98.39% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6c82686...191baf5. Read the comment docs.

[char0n]

I'm not sure I understand changes that have been made to this PR during last 3 commits. master branch now has isBlank function which is part of the public API of ramda-adjunct. We just cannot move it to internal directory anymore.

Now we should also fully utilize isBlank implementation to it's full potential:

const presence = when(isBlank, stubNull);

Notes to above implementation:

• present is opposite of blank
• when value is present return it, otherwise return null
• the above sentence can also be: when value is blank return null, othersiwe return the original value (and that's our implementation)

[tauantcamargo]

@char0n i got it .. i'll update it later ..

[char0n]

Right, let me know if you need any assistence