Squeaky Clean
10 Points
chars
Instructions
In this exercise you will implement a partial set of utility routines to help a developer clean up identifier names.
In the 6 tasks you will gradually build up the functions transform to convert single characters and clean to convert strings.
A valid identifier comprises zero or more letters, underscores, hyphens, question marks and emojis.
If an empty string is passed to the clean function, an empty string should be returned.
1. Replace any hyphens encountered with underscores
Implement the transform function to replace any hyphens with underscores.
julia> transform('-')
"_"2. Remove all whitespace
Remove all whitespace characters. This will include leading and trailing whitespace.
julia> transform(' ')
""3. Convert camelCase to kebab-case
Modify the transform function to convert camelCase to kebab-case
julia> transform('D')
"-d"4. Omit characters that are digits
Modify the transform function to omit any characters that are numeric.
julia> transform('7')
""5. Replace Greek lower case letters with question marks
Modify the transform function to replace any Greek letters in the range 'α' to 'ω'.
julia> transform('β')
"?"6. Combine these operations to operate on a string
Implement the clean function to apply these operations to an entire string.
Characters which fall outside the rules should pass through unchanged.
julia> clean(" a2b Cd-ω😀 ")
"ab-cd_?😀"Squeaky Clean
10 Points
chars
Instructions
In this exercise you will implement a partial set of utility routines to help a developer clean up identifier names.
In the 6 tasks you will gradually build up the functions transform to convert single characters and clean to convert strings.
A valid identifier comprises zero or more letters, underscores, hyphens, question marks and emojis.
If an empty string is passed to the clean function, an empty string should be returned.
1. Replace any hyphens encountered with underscores
Implement the transform function to replace any hyphens with underscores.
julia> transform('-')
"_"2. Remove all whitespace
Remove all whitespace characters. This will include leading and trailing whitespace.
julia> transform(' ')
""3. Convert camelCase to kebab-case
Modify the transform function to convert camelCase to kebab-case
julia> transform('D')
"-d"4. Omit characters that are digits
Modify the transform function to omit any characters that are numeric.
julia> transform('7')
""5. Replace Greek lower case letters with question marks
Modify the transform function to replace any Greek letters in the range 'α' to 'ω'.
julia> transform('β')
"?"6. Combine these operations to operate on a string
Implement the clean function to apply these operations to an entire string.
Characters which fall outside the rules should pass through unchanged.
julia> clean(" a2b Cd-ω😀 ")
"ab-cd_?😀"