Ruby编程之字符串拼接

s1 = "This " << "is" << " a string " << 36 # char 36 is '$'
s2 = "This " + "is" + " a string " + 36.to_s
s3 = "This " "is" " a string " + 36.to_s
puts("(s1):" << s1)
puts("(s2):" << s2)
puts("(s3):" << s3)

(s1):This is a string $
(s2):This is a string 36
(s3):This is a string 36

s4 = "This " , "is" , " not a string!", 10
print("print (s4):" , s4, "\n")
x = "This " , "is" , " not a string!", 36
print("print (x):" , x, "\n")
puts("puts(x):", x)
puts("puts x.class is: " << (x.class).to_s )
print("print(x):" , x, "\n")
puts("puts(x):", x)
puts("puts x.class is: " << (x.class).to_s )

print (s4):["This ", "is", " not a string!", 10]
print (x):["This ", "is", " not a string!", 36]
puts(x):
This
is
 not a string!
36
puts x.class is: Array
print(x):["This ", "is", " not a string!", 36]
puts(x):
This
is
 not a string!
36
puts x.class is: Array

开发环境:Rubymine

The book of Ruby----A hands-on guide for the Adventurous---[美]Huw Collingbourne---no starch press