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Jewels and stones: Difference between revisions
Added solution in Crystal
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(Added solution in Crystal) |
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<pre>aA in aAAbbbb: 3
z in ZZ: 0</pre>
=={{header|Crystal}}==
<lang ruby>stones, jewels = "aAAbbbb", "aA"
stones.count(jewels) # => 3
# The above solution works for that case, but fails with certain other "jewels":
stones, jewels = "aA^Bb", "^b"
stones.count(jewels) # => 4
# '^b' in the "jewels" is read as "characters other than 'b'".
# This works as intended though:
stones.count { |c| jewels.chars.includes?(c) } # => 2</lang>
=={{header|D}}==
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