Optional

A TypeScript implementation of Java’s Optional for Deno.

Usage

Simply import from deno.land, Github (raw), or any of the available open-source CDNs (e.g. jsDelivr, cdnjs, unpkg)

import { Optional } from 'https://deno.land/x/optional@1.0.0/mod.ts'

It is recommended to import the module using a URL with a tag instead of a branch name. This way, you lock your import to a specific version instead of whatever’s at the tip of the branch.

Features

• Implemented based on Java 11’s version of Optional.
• No dependencies.

Differences

• stream() available but not implemented. Will throw an error.
• hashCode() available but not implemented. Will throw an error.
• APIs that expect/return super/subclass values not supported yet.

Notes

Deno defaults with --strictNullChecks enabled. This forces developers to handle undefined and null cases whenever TypeScript is able to detect them. Optional may not be needed unless you’re in it for its API.