feat(presence): implemented presence function

[tauantcamargo]

Implemented presence function.

Issue: #654

[tauantcamargo]

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

[codecov[bot]]

Codecov Report

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

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  Coverage   98.39%   98.39%           
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  Files         234      234           
  Lines         622      622           
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  Hits          612      612           
  Misses         10       10           

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unittests	98.39% <0.00%> (ø)

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[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