What is ?E in str.index(?E)

Ruby
1

Dear all
I am learning Ruby. “The Ruby Way” has following example.

irb(main):047:0> str = “Albert Einstein”
=> “Albert Einstein”
irb(main):048:0> str.index(?E)
=> 7
irb(main):049:0> str1 = “mathematics”
=> “mathematics”
irb(main):050:0> flag1 = str1.include? ?e
=> true
irb(main):051:0>

What is ?E

(Does ? above work like shell globbing?)

I tried the FAQ online but could not get anything…

TIA for any pointers/online help

– thx atul

2

On May 26, 2008, at 9:39 PM, askingagain wrote:

=> true
– thx atul

cfp:~ > cat a.rb
p ?A
p ‘A’[0]
p 65.chr

cfp:~ > ruby a.rb
65
65
“A”

a @ http://codeforpeople.com/

3

askingagain wrote:

=> true
– thx atul
See: Programming Ruby: The Pragmatic Programmer's Guide

“You can also get the integer value corresponding to an ASCII character
or escape sequence by preceding it with a question mark.”