How do I declare variables and use string interpolation in an EK9 program?

← Getting Started · Ref: Q872

Declare variables with '<-' (type is inferred). Use backtick strings with ${expression} for interpolation. EK9 infers the type from the assigned value — no need to declare types explicitly for locals.

See Q37 for strings. See Q22 for variable declaration. Use 'ek9 -h String' for string methods.

Example

defines module qa.getting.started.variables

  defines program

    VariableDemo()
      stdout <- Stdout()

      greeting <- "Hello"
      userName <- "Steve"
      age <- 42

      stdout.println(`${greeting}, ${userName}!`)
      stdout.println(`You are ${age} years old`)

Other ways to ask this

Show me variable declaration with interpolated strings in EK9
How do backtick strings work in EK9?
EK9 string templates with variables

Coming from another language?

Java: var keyword (Java 10+). Python: dynamic typing. Kotlin: val/var. EK9: '<-' with type inference.

Keywords: backtick, declaration, string, template, inference, variable, interpolation