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lang-rb
word[0] = word[0].upcasewordvariable. Of course, if you have more words, just call them on all of them! ;)words.map{|word| word[0] = word[0].upcase}#capitalize!and not#capitalize. The latter returns a new String while the former modifies the receiver of the method (in this case the receiver iswordand the method is#[]). If you used your code inside of a #collect block then you'd end up with two different arrays with the same String objects in each of them (and the Strings would have been modified). That is not something you'd normally want to do. Even if you're aware of this, other readers should understand this.