[FEATURE] Add toSnakeCase

[Chalarangelo]

Converts a string to snakecase.

Description

Lodash[ACTION] #100 -> https://lodash.com/docs/4.17.4#snakeCase

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• Website
• Snippets
• General / Things regarding the repository (like CI Integration)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Enhancement (non-breaking improvement of a snippet)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have checked that the changes are working properly
• I have checked that there isn't any PR doing the same
• I have read the CONTRIBUTING document.

[rohitanwar]

toSnakeCase('Teletubbies say Eh-oh') returns "_teletubbies_say__eh_oh" on my google chrome console. Adding the following line in end will help
str.startsWith('-') ? str.slice(1,str.length) : str;

[Chalarangelo]

@kriadmin Good edge case I missed, however that might be sub-optimal. Maybe there's a regex way to deal with that?

[rohitanwar]

I already knew about this edge case from about a month ago. This can't be dealt with regex(according to me). Checking if it starts with '-' is the only solution(acc to me).

[Chalarangelo]

Alright, I'll not merge and wait for a couple more opinions until tomorrow. If there's no better (i.e. more elegant) way, this is a pretty decent fix nonetheless, so I'll update and merge later.

[iamsoorena]

@Chalarangelo I also see that the last test returns this:
some_mixed_string__with_spaces_underscores_and_hyphens
take a closer look before with
It added two underscores.

[Chalarangelo]

@iamsoorena Good catch, I'll see if I can figure out a way to update it tomorrow, then. Feel free to apply fixes if you figure it out before I do!

[elderhsouza]

@kriadmin @Chalarangelo
I tried my hand on it, checking if the uppercase character is preceded by a character first.

[rohitanwar]

@elderhsouza Try this text "I     have   Lot's of   _Spaces"

[Chalarangelo]

I just made some updates, replacing multiple spaces/hyphens/underscores with a single underscore, this should now work pretty much fine. Can you find any more edge-cases we might have missed?

[rohitanwar]

What about 'ThisIsAURL' ?

[Chalarangelo]

@kriadmin I see how you would want to handle this but I don't think that any library would handle it properly anyways.

[rohitanwar]

@Chalarangelo Lodash returns this_is_url

[rohitanwar]

@Chalarangelo See the second comment here lodash/lodash#561 by jdalton

[Chalarangelo]

@kriadmin That would require a lot of code to handle just one (or a select few) cases. If it doesn't make the snippet very difficult to read, I'm not against it, however I am not sure I can implement this on my own. Suggestions are welcome, I'm marking this snippet on hold, although I believe the toKebabCase snippet was merged already by someone else and has the same issue. I am merging this one, too, as they behave the same and feel free to open a PR fixing the issue if it is somehow doable.