Skip to content

String interpolation

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. It is a form of simple template processing or, in formal terms, a form of quasi-quotation (or logic substitution interpretation). String interpolation allows easier and more intuitive string formatting and content-specification compared with string concatenation.

C# 

string name = "Mark";
var date = DateTime.Now;
Console.WriteLine($"Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.");

Python 

name = "Mark"
print(f'Hello, {name}!')

See also

  • Programming Language
  • Concatenation
  • Improper input validation
  • printf format string
  • Quasi-quotation
  • String literal
  • Substitution

Favorite site