Ruby%Q,%Q,%W,%W,%x,%r,%s,%i

%Q

The string used to replace the double quotation marks. When you need to put a lot of quotes in the string, you can use the following method without adding a backslash (\ ") to the quotation marks.

%Q (Joe said: "Frank said:"#{what_frank_said}"")"Joe said:""hello!" "     " 

(...) Other non-alphanumeric symbols or paired symbols can also be substituted, such as ..., ..., ..., ... [ ] ! ! + + { } , < > ...,........ such as.

The following wording is all equivalent to the above:

%q! Joe said: "Frank said:"#{what_frank_said} ""!  %q[joe said: "Frank said:"#{what_frank_said}""%q+joe said: "Frank said:"#{What_ Frank_said}"" +             

In addition, writing can be omitted Q :

%/joe said: "Frank said:" #{what_frank_said} ""/"Joe said:"  

%q

%Qsimilar, but represents a single-quote string

%q (Joe said: ' Frank said: ' #{what_frank_said} ')"Joe said: ' Frank said: '\#   

%W

The syntax is approximate to the %Q array in which the elements are enclosed in double quotation marks.

%W (#{foo} bar withspace)["foo" "Bar" "Bar withspace"  

%w

Used to represent an array where the elements are enclosed in quotation marks. It is strange that \ (slash spaces) will be converted to (spaces), but the rest of the content will not.

\#e #{1}f)["a""B""C D""\ \#e""\#{1}f"]   

%x

Use the ' method to execute a shell script and return the standard output content.

%x (echo foo:#{foo})"Foo:foo\  n     

%r

Syntax is approximate %Q and is used for regular expressions.

%r (/home/#{foo}"/\ \ home\ \        

%s

Used to represent the symbol, but it does not convert content such as an expression

%s (foo): Foo%s (foo bar): "foo bar"%s (#{foo} bar): "\#{foo} bar"   

%i

Syntax introduced after Ruby 2.0, used to generate a symbol array

2.  0.  0:%i (a b c)[: a: b: C           

Original address: https://ruby-china.org/topics/18512

Ruby%Q,%Q,%W,%W,%x,%r,%s,%i