typomath/src/steps/three.ts

13 lines
335 B
TypeScript

import overload from '../util/overload.js'
const adder = overload([
(x: number, y: number) => {
if (typeof x === 'number' && typeof y === 'number') return x + y
throw new TypeError('Can only add numbers')
},
(x: string, y: string) => 'Yay' + x + y
])
console.log(adder(1, 2))
console.log(adder('a', 'b'))