String interpolation

Learn to embed variables in strings with \$.

With string interpolation you can embed variables or expressions inside a string. This uses the $ sign.

For a simple variable, just write $name. For an expression or property you need curly braces: ${name.length} or ${a + b}.

This is more readable than concatenating with +. Instead of 'Hello ' + name you write 'Hello $name'.

Exercise Greet by name

Declare a name variable (set to Alex) and use string interpolation to print Hello Alex. That is, write it as 'Hello $name'.

Show example solution

void main() {
  var name = 'Alex';
  print('Hello $name');
}

If the text following the $ sign is just an identifier (variable name), no curly braces are needed: $name, $age.

But if you use a property with a dot (name.length), an index (list[0]) or arithmetic (a + b), you must write ${...}.

If unsure, you can always use ${}; ${name} is also valid. What matters is being consistent.

Interpolation sign

var name = 'Derya'; print('Hello ____name');

Show answer

var name = 'Derya'; print('Hello $name');