If a is null, it resolves to b. However, i haven't found a direct analogue of the typeof operator in dart. It's primarily used as a type cast operator.
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What is the difference between the = and := operators, and what are the use cases for them?
If a is not null, it resolves to a.
They both seem to be for an assignment? Final mystringlist = prefs.getstringlist('my_string_list_key') ?? Sql and a few other languages have this operator. List of all dart operators it's the coalesce operator.
This is useful if you want to avoid the presence of null values triggering errors in your code. As means different things in different contexts. Thankfully the dart:mirrors reflection api has recently been added to the sdk, and is now available for download in. The following line of code has two question marks:
From the dart language tour:
The safe call operator returns null if the object's property is null. 但是这是一个福利非常好的部门，所有价值连城的tour你去玩都不花钱，只要boss够好，3500美金的南极飞机团你都可以去！ ！ 而且每个港口tour operator等人开车来带着shorex team出. Typecast (also used to specify library prefixes) it links to an.
