Merge pull request #13 from fsouza/remove-mutex

parallel: remove mutex from Map and Times

Merge pull request #12 from lepijohnny/master

Update README.md

feat: adding attempt + repeat + times

fix Nth

oops

Last and Nth return errors

Merge pull request #2 from samber/feat-parallel

Adding lop.Map and lop.ForEach

adding index arguments to Map, ForEach and Reduce

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