Loops: while, do while, and for

Dart supports the most common loop constructs, the for loop supports the for in notation and it can be used inside list/collection literals starting from Dart 2.3:

​ ​var​ list1 = [
​  ​for​(​int​ i = 0; i < 100; i++)
​  i,
​ ];
​ ​var​ list2 = [
​  ​for​(​var​ element ​in​ list1)
​  ​"#​​$element​​"​,
​ ];
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