Prefixing the string with ‘r’ will cancel any string interpolation within that string. The following code sample shows that.

void main() 
{
  var numA = 3;
  var numB = 4;
  print(r"$numA + $numB = ${numA+numB}");
}

The following video clip shows the execution of this code sample, overviews it and explains it.

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