O | /src/option/mod.ts | ahh@v0.10.3

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Idiomatic type-safety functions.

method O.isNone

import { O } from "https://deno.land/x/ahh@v0.10.3/src/option/mod.ts";

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

Returns whether opt is a None.

Examples

Example 1

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

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