Ruby String
Operations
Arithmetic
a = "ru" + "by" #=> "ruby" a * 3 #=> "rubyrubyruby" 3 * a #=> TypeError
<< method
a = "ru" p a << "by" p a # ruby [/ruby] <b>Compare</b> [ruby] "a" < "b" #=> true "ab" < "ac" #=> true "Ab" == "Ab" #=> true "Ab" <=> "Ab" #=> 0
Byte length
"abcde".length "ほむほむ".length # Multi byte
sprintf
Same as C
sprintf("result: %#b", 16) # binary sprintf("result: %#o", 16) # 8進数 sprintf("result: %#x", 16) sprintf("result: %#X", 16) sprintf("result: %02d", 1) sprintf("result: %03d", 1) sprintf("result: %05.2f", 1.1111)
String to Integer, Integer to String
to_i, to_f String to Integer
"100".to_i "1.9".to_f "12ab3".to_i #=> 12 "12ab3".to_f #=> 12.0 "1.9".to_i #=> 1 "1.9.9".to_f #=> 1.9
to_s Integer to String
12.to_s
split
str = "12,35,67 ,23,35,67 ,12,23" strs = str.split(' ') p strs # ["12,35,67", ",23,35,67", ",12,23"]
slice
str = "1stdcgt" news = slice(1, str[i].length-1) p news # stdcgt