在接口定义中可以使用getters / setter吗? [英] Is it possible to use getters/setters in interface definition?
问题描述
目前, TypeScript
不允许在接口中使用get / set方法(访问器)。
例如:
interface I {
get name():string;
}
class C implements I {
get name():string {
return null;
$ b 此外,TypeScript不允许使用数组函数表达式类方法:
例如:
class C {
private _name:string;
获取name():string => this._name;
$ / code>
有没有其他方法可以在接口定义上使用getter和setter ?
解决方案您可以在接口上指定属性,但无法强制执行是否使用getters和setters,就像这样:
interface IExample {
名称:string;
}
类示例实现IExample {
private _name:string =Bob;
public get Name(){
return this._name;
}
公共集合名称(值){
this._name = value;
}
}
var示例= new示例();
alert(example.Name);
在这个例子中,接口不强制类使用getters和setters,我可以使用了一个属性(下面的例子) - 但接口应该隐藏这些实现细节,因为它是调用代码有关它可以调用的一个承诺。
interface IExample {
名称:string;
}
类示例实现IExample {
//这满足接口只是相同的
public Name:string =Bob;
}
var示例= new示例();
alert(example.Name);
最后, =>
不是允许使用类方法 - 如果您认为存在燃烧的用例,您可以开始讨论Codeplex 。这是一个例子:
class Test {
//是
getName =()=> 史蒂夫;
//无
getName()=> 史蒂夫;
//无
获取name()=> 史蒂夫;
}
At the moment, TypeScript
does not allow use get/set methods(accessors) in interfaces.
For example:
interface I {
get name():string;
}
class C implements I {
get name():string {
return null;
}
}
furthermore, TypeScript does not allow use Array Function Expression in class methods:
for ex.:
class C {
private _name:string;
get name():string => this._name;
}
Is there any other way I can use a getter and setter on an interface definition?
解决方案 You can specify the property on the interface, but you can't enforce whether getters and setters are used, like this:
interface IExample {
Name: string;
}
class Example implements IExample {
private _name: string = "Bob";
public get Name() {
return this._name;
}
public set Name(value) {
this._name = value;
}
}
var example = new Example();
alert(example.Name);
In this example, the interface doesn't force the class to use getters and setters, I could have used a property instead (example below) - but the interface is supposed to hide these implementation details anyway as it is a promise to the calling code about what it can call.
interface IExample {
Name: string;
}
class Example implements IExample {
// this satisfies the interface just the same
public Name: string = "Bob";
}
var example = new Example();
alert(example.Name);
And lastly, =>
is not allowed for class methods - you could start a discussion on Codeplex if you think there is a burning use case for it. Here is an example:
class Test {
// Yes
getName = () => 'Steve';
// No
getName() => 'Steve';
// No
get name() => 'Steve';
}
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