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NachoToast/extendNumber.ts

Created January 10, 2023 03:50
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Existing Class Extending in Typescript
Raw
extendNumber.ts
// typing of implementation is not checked by the compiler, only calls to it
declare global {
interface Number {
between: (min: number, max: number) => boolean;
}
}
Object.defineProperty(Number.prototype, 'between', {
value(min: number, max: number): boolean {
return this >= min && this <= max;
},
});
const p = 5;
console.log(p.between(5, 10)); // true
console.log(p.between(0, 4)); // false
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