Ruby: Quote String

Quote String Literally

Use APOSTROPHE quote to quote string exactly. (literal string)

\n has no special meaning inside APOSTROPHE quote.

# use APOSTROPHE quote for string literally
aa = 'tiger'
p aa
# "tiger"

# contain contain newline char
cc = 'a
b'

print cc
# prints 2 lines

String with Escape Sequence

Use double quote for string that contains newline escape \n, or include variable values or Ruby code.

xx = "A\nB"
puts xx
# prints in 2 lines

You can use \n for newline, and \t for tab, etc.

String with Embeded Expression

To evaluate a variable or Ruby code within a string, use

#{…}

# put variable value inside a string
aa = 4
bb = "#{aa} cats"
p bb == "4 cats"

# eval Ruby code inside a string
p "#{1+2} cats" == "3 cats"

Perl tip: Ruby's string quoting system is similar to Perl's. 〔see Perl: Quote Strings〕