react18-学习笔记15-泛型

function echo(arg:any):any{
    return arg
}
const result=echo(123)

function echo<T>(arg:T):T{
    return arg
}

const result1=echo(123)

function swap<T,U>(tuple:[T,U]):[U,T]{
    return [tuple[1],tuple[0]]
}
const result=swap(['string',123])