| 1 |
We can use scalar variables in strings
-
$h= "World"; $hw= "Hello $h"; # sets $hw to "Hello World"
-
$h= "World"; $hw= "\UHello $h"; # sets $hw to "HELLO WORLD"
-
showing how \U and similarly \L operate on interpolated variables
|
| 2 |
As mentioned, there is NO interpolation for single quoted strings
|
| 3 |
There is also no recursion as illustrated below:
|
| 4 |
$fred= "You over there"; $x= '$fred'; $y= "Hey $x"; # sets $y as "Hey $fred" with no interpolation
|
| 5 |
Use \$ to ensure no interpolation where you need real $ character
-
$fred= "You over there"; $y= "Hey \$fred"; # sets $y as "Hey $fred" with no interpolation whereas:
-
$fred= "You over there"; $y= "Hey $fred"; # sets $y as "Hey You over there" with interpolation used
|
| 6 |
Use ${var} to remove ambiguity as in
-
$y= "Hey ${fred}followed by more characters";
|
