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related to question: How do I substitute with an evaluated expression in Perl?
In Perl, is there a way like in Ruby to do:
$a = 1; print "#{$a + 1}"; and it can print out 2?
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Using string interpolation, we can use objects and expressions as a part of the string interpolation operation. C# string interpolation is a method of concatenating, formatting and manipulating strings. This feature was introduced in C# 6.
In computer programming, string interpolation (or variable interpolation, variable substitution, or variable expansion) is the process of evaluating a string literal containing one or more placeholders, yielding a result in which the placeholders are replaced with their corresponding values.
Interpolation in Perl refers to the process where the respective values replace the variable names. It is commonly used inside double-quoted strings.
String interpolation is a technique that enables you to insert expression values into literal strings. It is also known as variable substitution, variable interpolation, or variable expansion. It is a process of evaluating string literals containing one or more placeholders that get replaced by corresponding values.
There's a similar shorthand in Perl for this:
$a = 1; print "@{[$a + 1]}" This works because the [] creates a reference to an array containing one element (the result of the calculation), and then the @{} dereferences the array, which inside string interpolation prints each element of the array in sequence. Since there is only one, it just prints the one element.
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You can use the @{[ EXPRESSION ]} trick that Greg Hewgill mentioned.
There's also the Interpolation module, which allows you to do arbitrary transformations on the values you're interpolating (like encode HTML entities) in addition to evaluating expressions.
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