Ruby Challenge - efficiently change the last character of every word in a sentence to a capital
- by emson
Hi All
I recently was challenged to write some Ruby code to change the last character of every word in a sentence into a capital. Such that the string:
"script to convert the last letter of every word to a capital"
becomes
"scripT tO converT thE lasT letteR oF everY worD tO A capitaL"
This was my optimal solution however I'm sure you wizards have much better solutions and I would be really interested to hear them.
"script to convert the last letter of every word to a capital".split.map{|w|w<<w.slice!(-1).chr.upcase}.join' '
For those interested as to what is going on here is an explanation.
split will split the sentence up into an array, the default delimiter is a space and with Ruby you don't need to use brackets here.
map the array from split is passed to map which opens a block and process each word (w) in the array. the block slice!(s) off the last character of the word and converts it to a chr (a character not ASCII code) and then capitalises upcase it. This character is now appended << to the word which is missing the sliced last letter. Finally the array of words is now join together with a ' ' to reform the sentence.
Enjoy
