typeScript 泛型使用和泛型接口结合

function getMin1(arr:number[]):number {
 let min = arr[0]
 for (var i = 1; i < arr.length; i++){
  if (min > arr[i]) {
   min = arr[i]
  }
 }
 return min
}
console.log(getMin1([1, 2, 3, 4]));
function getMin2(arr:string[]):string {
 let min = arr[0]
 for (var i = 1; i < arr.length; i++){
  if (min > arr[i]) {
   min = arr[i]
  }
 }
 return min
}
console.log(getMin2(['a', 'b', 'c']));

function fnName<T>(arg:T,...):T{
 return ...
}

function getMin<T>(arr: T[]): T{
 let min = arr[0]
 for (var i = 1; i < arr.length; i++){
  if (min > arr[i]) {
   min = arr[i]
  }
 }
 return min
}
getMin<number>([1, 2, 3, 4])
getMin<string>(['a', 'b', 'c', 'd'])

getMin([1, 2, 3, 4])
getMin(['a', 'b', 'c', 'd'])

function fn<T, U>(arg1: T, arg2: U) {
 return arg1
}

function fn<T>(arg1: T) {
 return arg1
}
let Fn: <M>(arg1: M) => M = fn

function fn<T>(arg1: T) {
 return arg1
}
let Fn: {<T>(arg: T): T} = fn

let Fn: { <T>(arg: T): T } = fn

//替换为

interface FnInter{
 <T>(arg: T): T
}
let Fn: FnInter = fn

interface FnInter<T>{
 (arg:T): T
}
let Fn: FnInter<string> = fn

class 名称<T>{}
new 类名<类型>()

class GetMin<T>{
  arr: T[] = []
  add(ele:T) {
 this.arr.push(ele)
  }
  getMin(): T{
 var min = this.arr[0]
 for (var i = 0; i < this.arr.length; i++){
  if (min > this.arr[i]) {
   min = this.arr[i]
  }
 }
 return min
 }
}
let gMin1 = new GetMin<number>()
gMin1.add(1)
gMin1.add(5)
console.log(gMin1.getMin());//1

let gMin2 = new GetMin<string>()
gMin2.add('a')
gMin2.add('b')
console.log(gMin2.getMin());//2

function getLength<T>(val: T): number {
 return val.length;
}

interface ILen{
 length:number
}
function getLength<T extends ILen>(val: T): number {
 return val.length;
}
console.log(getLength<string>("abcd"));
console.log(getLength<number>(1)); //错误提示：类型“number”不满足约束“ILen”。

interface P<T = string>{
 name:T
}
let p1: P = { name: "小姐姐" }
let p2: P<number> = { name: 18 }

T extends U ? X : Y