/* 一行の時はreturnも{}も省略可 */
const addBase = (a: number = 120, b?: number = 12): number => a + b
const x = addBase(undefined, 9)
const y = addBase(100)
console.log(x)
console.log(y)
// ===== 関数のオーバーロード =====
function overNum(a: number, b: number): number; // 関数のシグネチャ = 組み合わせ
function overStr(a: string, b: string): string;
// 実務的な書き方
function overLoad(a: any, b: any): any {
if (typeof a === "number" && typeof b === "number") {
return a + b
}
return a + " " + b
}
overLoad(1, 2)
overLoad("much", 2)
