[英]Typescript - Higher order function types
I'm getting really excited about TypeScript. 我对TypeScript感到非常兴奋。 How do you set the type of a function parameter?
如何设置函数参数的类型?
function twoMoreThanYou(calculateANumber: Function):number {
return calculateANumber(4) + 2;
}
function double(n:number):number {
return n*2;
}
console.log("TWO MORE", twoMoreThanYou(double))
How can I type calculateANumber
better? 如何更好地输入
calculateANumber
? I'd like to specify that it must be a function that takes a number and returns a number. 我想指定它必须是一个带数字的函数并返回一个数字。
Can I then make an "interface" or some shorthand for that type so I can make my higher order function signatures more readable? 然后,我可以为该类型创建一个“界面”或一些简写,这样我可以使我的高阶函数签名更具可读性吗?
These both work 这两个都有效
interface NumberFunction extends Function {
(n:number):number;
}
function twoMoreThanYou(calculateANumber: (n:number)=>number):number {
...
}
function twoMoreThanYou(calculateANumber: NumberFunction):number {
...
}
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