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I have seen a lot of tutorials using dot, while some use 2. What is the actual meaning of this?
Example,
Array().add()
Animation()..addListener(() {})
518
A pair of overdots placed over a symbol, as in , most commonly used to denote a second derivative with respect to time, i.e., .
In filesystems, we use the double dot (..) to access the parent directory, whereas the single dot (.) represents the current directory.
The colon : is a punctuation mark consisting of two equally sized dots aligned vertically. A colon often precedes an explanation, a list, or a quoted sentence.
The .. operator is dart "cascade" operator. Useful for chaining operations when you don't care about the return value.
This is also dart solution to chainable functions that always return this
It is made so that the following
final foo = Foo()
..first()
..second();
Is strictly equals to this:
final foo = Foo();
foo.first();
foo.second();
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