CODEWITHSUNDEEP
rubyascii
user2668
user2668

Reputation: 373

Ruby: character to ascii from a string

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
                ^

Upvotes: 37

Views: 118667

Answers (7)

LastZactionHero
LastZactionHero

Reputation: 289

Ruby 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]

Upvotes: 14

nikkypx
nikkypx

Reputation: 2005

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]

Upvotes: 8

Sh.K
Sh.K

Reputation: 299

use "x".ord for a single character or "xyz".sum for a whole string.

Upvotes: 12

alexsuslin
alexsuslin

Reputation: 4225

puts "string".split('').map(&:ord).to_s

Upvotes: 22

user209041
user209041

Reputation:

please refer to this post for the changes in ruby1.9 Getting an ASCII character code in Ruby using `?` (question mark) fails

Upvotes: 8

Mark
Mark

Reputation: 41115

"a"[0]

or

?a

Both would return their ASCII equivalent.

Upvotes: 5

Konrad Rudolph
Konrad Rudolph

Reputation: 545598

The c variable already contains the char code!

"string".each_byte do |c|
    puts c
end

yields

115
116
114
105
110
103

Upvotes: 60

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