What is double dots in Dart?

Ratio. The colon : is a punctuation mark consisting of two equally sized dots placed on the same vertical line. A colon often precedes an explanation, a list, or a quoted sentence.

Since version 2.3, Dart adds a new operator called spread which uses three dots ( … ) notations. It can be used to extend the elements of a Collection . The examples below show the usage of the notation on List , Set , and Map .

Cascade notation is syntactic sugar in Dart that allows you to make a sequence of operations on the same object. You can use the “double dot” to call functions on objects and access properties . This “operator” is simply used to make your code cleaner and concise.