Posts Tagged ‘[ ] operator’
In the series of posts that have Ruby Quirks in the title, my goal is to keep track of unexpected behaviors I encounter with Ruby as I continue learning the language. I will divide the quirks into separate sections (most likely respective classes) as I encounter them.
Since it is the same post, that will be constantly updated, I will put the date I encountered a particular quirk next to it’s subheading. I am going to take Pete’s advice and write separate posts for each quirk I encounter.
String class has
 operator that allows us to get a substring for a given string. For example:
name = "Ashish"
str = name[2,3] # str contains "his"
However, if you pass a single index to the
 operator, the response is not something you would expect. For example:
char = name # char contains 115, the ASCII representation of the character s
While we are in the topic of characters & their ASCII representation, Ruby provides a
? operator to evaluate the ASCII representation of a string. For example:
?a # returns 97
?A # returns 65
?s # returns 115
?AA # results in SyntaxError
This quirk can be seen in Ruby 1.8.7 & earlier versions of Ruby. However, from 1.9.1, the behavior is as expected. For example, in 1.9.1 and beyond:
?a # returns a
"Ashish" # returns s