CamelCase Conversion Functions | Dataford Interview Questions

Your question is CamelCase Conversion Functions. Start with the requirements on the right.

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Andela's developer tooling needs consistent names for generated fields and readable labels for display. Implement both directions of a naming conversion: convert normal text into lower camelCase, then convert lower camelCase back into lowercase, space-separated text.

Formal Specification

Implement convert_case(text, mode), where text is a string and mode is either "to_camel" or "from_camel".

For "to_camel", treat spaces, hyphens, and underscores as word separators. Return the first word in lowercase and capitalize the first character of every later word.
For "from_camel", insert word boundaries before uppercase letters, including boundaries between an acronym and a normally capitalized word. Return all words in lowercase, separated by single spaces.
Inputs contain only ASCII letters, digits, spaces, hyphens, and underscores. Leading, trailing, or repeated separators should be ignored.
A camelCase input starts with a lowercase letter or digit and contains no separators.

Constraints

0 <= len(text) <= 10^5
mode is either "to_camel" or "from_camel"
Input characters are ASCII letters, digits, spaces, hyphens, or underscores
Leading, trailing, and repeated separators may occur in normal text

Function Signature

def convert_case(text, mode):