Collection Literals

Collection For

Inline Transformation

A for (var x in xs) inside a literal generates elements without a separate loop.

Program

Play the program to build a doubled copy of a list inline.

collection_for.dart 
void main() {
  var input = [1, 2, 3];
  var doubled = [for (var n in input) n * 2];
  print(doubled);
}
collection-for `for (var n in input) n * 2` yields each transformed element.
comprehension-like Compact alternative to `map` plus `toList`.
readable The shape of the output list matches the literal.