this wiki page gave a general idea of how to convert a single char to ascii http://en.wikibooks.org/wiki/Ruby_Programming/ASCII
But say if I have a string and I wanted to get each character's ascii from it, what do i need to do?
"string".each_byte do |c|
$char = c.chr
$ascii = ?char
puts $ascii
end
It doesn't work because it's not happy with the line $ascii = ?char
syntax error, unexpected '?'
$ascii = ?char
^
The c variable already contains the char code!
"string".each_byte do |c|
puts c
end
yields
115
116
114
105
110
103
puts "string".split('').map(&:ord).to_s
split('') is calling charsRuby String provides the codepoints method after 1.9.1.
str = 'hello world'
str.codepoints
=> [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]
str = "你好世界"
str.codepoints
=> [20320, 22909, 19990, 30028]
.to_a after codepoints? Seems like codepoints already returns an array "abcde".codepoints.class #=> Arrayuse "x".ord for a single character or "xyz".sum for a whole string.
please refer to this post for the changes in ruby1.9 Getting an ASCII character code in Ruby using `?` (question mark) fails
You could also just call to_a after each_byte or even better String#bytes
=> 'hello world'.each_byte.to_a
=> [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]
=> 'hello world'.bytes
=> [104, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100]
"a"[0]
or
?a
Both would return their ASCII equivalent.
