TypeScript基础(三)--泛型

泛型

// 泛型函数
function identity<T>(arg: T): T{
    
    
  console.log(arg)
  return arg
}

function log<T>(arg: Array<T>): Array<T>{
    
    
  console.log(arg)
  return arg
}

// 泛型接口
interface identityInterface<T> {
    
    
  (arg: T): T
}

let identity: identityInterface<string> = function (str: string) {
    
    
  return str;
};

// 泛型类
class GenericNumber<T> {
    
    
  zeroValue: T;
  add: (x: T, y: T) => T;
}

let myGenericNumber = new GenericNumber<number>();
myGenericNumber.zeroValue = 0;
myGenericNumber.add = function(x, y) {
    
     return x + y; };