O | /mod.ts | ahh@v0.10.1

Idiomatic type-safety functions.

method O.isNone

Re-export

import { O } from "https://deno.land/x/ahh@v0.10.1/mod.ts";

isNone<T>(opt: Option<T>): opt is None

Returns whether opt is a None.

Examples

import { O, None } from "./mod.ts";

console.log(O.isNone(1)); // false
console.log(O.isNone(None)); // true