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{{short description|Replacing placeholders in a string with values}}
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 [[Form (document)#Placeholders|placeholders]], yielding a result in which the placeholders are replaced with their corresponding values. It is a form of simple [[Template processor|template processing]]<ref>"[
String interpolation is an alternative to building string via [[concatenation]], which requires repeat quoting and unquoting;<ref>{{Cite web|url=http://perlmeme.org/howtos/using_perl/interpolation.html|title = Interpolation in Perl |date = 12 December 2024 |quote="This is much tidier than repeat uses of the '.' concatenation operator."}}</ref> or substituting into a [[printf format string]], where the variable is far from where it is used. Compare:
<syntaxhighlight lang="ruby">
apples = 4
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</syntaxhighlight>
They were removed in Java 23 due to design issues.<ref>{{cite web | title=Significant Changes in the JDK | url=https://docs.oracle.com/en/java/javase/23/migrate/significant-changes-jdk-release.html }}</ref>
=== JavaScript ===
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