typescript-一一网

node运行ts代码：

npm install -g typescript
npm install -g ts-node
npm install -g ts-node
node demo.js

function add({ first, second }: { first: number; second: number }): number {
  return first + second;
}


const func1: (str: string) => number = (str) => {
  return parseInt(str, 10);
};

const func = (str: string): number => {
  return parseInt(str);
};

const arr: (number | string)[] = ["1", 2, 3];
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