react18-学习笔记16-约束泛型

//数组 array
function geyao<T>(arg:T[]):T[]{
    console.log(arg.length)
    return arg
}
interface IWithLength{
    length:number
}

function haha<T extends IWithLength>(arg:T):T{
    console.log(arg.length)
    return arg
}