operator known as Null Coalescing Operator . It returns its first operand if it exists and is not NULL; otherwise, it returns its second operand. It evaluates from left to right.
Read moreWhy do some flutters have three dots?
spread operator (…) is used to provide a way to assign values to Collections , more commonly it found inside the column to render its child.
Read moreHow do you do the 3 dots flutter?
How to add 3 dot popup menu in AppBar in Flutter
Read moreWhat is dot dot in Dart?
.. is known as cascade notation . It allows you to not repeat the same target if you want to call several methods on the same object.
Read more