[英]Typescript keyof return array of strings
Let's say I have a class: 假设我有一节课:
class Test {
propA;
propB;
propC;
}
I want to create a method that returns an array of strings and type it to be only the keys existing in the Test class, how can I do this with the keyof
feature? 我想创建一个返回字符串数组的方法,并将其键入为Test类中现有的键,如何使用
keyof
功能执行此keyof
?
class Test {
propA;
propB;
propC;
getSomeKeys() : keyof Test[] {
return ['propA', 'propC']
}
}
You need to wrap the keyof Test
in brackets: 您需要将
keyof Test
包装在括号中:
class Test {
//...
getSomeKeys() : (keyof Test)[] {
return ['propA', 'propC']
}
}
Note though, that keyof also includes getSomeKeys in this case. 但请注意,在这种情况下,keyof还包括getSomeKeys。
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