Discussion on: Daily Challenge #34 - WeIrD StRiNg CaSe

[Ken Bellows]

Python solution:

toWeirdCase = lambda s: ''.join([c.lower() if i%2 else c.upper() for i,c in enumerate(s)])

print(toWeirdCase('String')) #=> StRiNg
print(toWeirdCase('Weird string case')) #=> WeIrD StRiNg cAsE

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EDIT
@dance2die pointed out in this comment that the multi-word example in the post seems to suggest that each word should be considered and cased separately, rather than the whole string. In that case, this becomes a bit more interesting.

Here's a simple modification to account only for spaces separating words:

toWeirdCase = lambda s: ' '.join([wordToWeirdCase(w) for w in s.split(' ')])
wordToWeirdCase = lambda s: ''.join([c.lower() if i%2 else c.upper() for i,c in enumerate(s)])

print(toWeirdCase('String')) #=> StRiNg
print(toWeirdCase('Weird string case')) #=> WeIrD StRiNg CaSe

But this could get a lot more complex if we need to account for things like punctuation and other whitespace characters.

As one last example, here's one that handles alternative whitespace characters using regular expressions:

import re

toWeirdCase = lambda s: (
  s[:re.search(r'\S', s).start() if re.match(r'\s', s) else 0] +   # handle leading whitespace
  ''.join(
    [wordToWeirdCase(w) for w in re.findall(r'\S+(?:\s+)?', s)]
  )
)

wordToWeirdCase = lambda s: ''.join([c.lower() if i%2 else c.upper() for i,c in enumerate(s)])

print(toWeirdCase('String')) #=> 'StRiNg'
print(toWeirdCase('Weird string case')) #=> 'WeIrD StRiNg CaSe'
print(toWeirdCase('  hELLO world\tHOW\'S EVeryTHInG???')) #=> '  HeLlO WoRlD   HoW'S EvErYtHiNg???'