dart中factory关键词的使用 一. 官方的描述 Use the factory keyword when implementing a constructor that doesn’t always create a new instance of its class. For example, a factory constructor might return an instance from a cache, or it might return an instance of a subtype. 当你使用factory...
Use the factory keyword when implementing a constructor that doesn’t always create a new instance of its class. For example, a factory constructor might return an instance from a cache, or it might return an instance of a subtype.当你使用factory关键词时,你能控制在使用构造函数时,并不总是创...
一. 官方的描述 Use the factory keyword when implementing a constructor that doesn’t always cr...
In Dart there is an interesting language feature called ‘Factory Constructors’, which effectively allows you to override the default behaviour when using thenewkeyword – instead of alwayscreatinga new instance the factory constructor is merely required toreturnan instance of the class, the differen...
Describe the issue When initialize an object with default value using factory constructor, warning will be showed. However if I add the const keyword, the code will fail to compile. Remove the type will result in runtime error. To Reprod...
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