Optional

Main

The optional class lets you handle possible null values in a programatic way, this way, you can avoid the use of multiple if statements in your code. This plugin has been inspired by Optinal from Java 8.

Methods

Method	Description
of	Creates a new optional from a value
ofNullable	Creates a new optional from a value, if value is not present or null then it creates an empty instance of Optional.
ifPresent	Returns a boolean value. True if value is present (not null), otherwise false.
get	Returns value of Optional.
orElseGet	Tries to get the value of the Optional instance, if it is not present then it returns a default value passed in the argument of the method
orElseThrows	Tries to get the value of the Optional instance, if it is not present then it throws a custom error.

Usage

import { Optional } from "https://deno.land/x/mandarinets/pluggins/optional.ts";

let myNullVariable = null;
Optional.of(myNullVariable).ifPresent(); // Returns `false` because value is null.

let organizationName = null;
Optional.of(organizationName).orElseGet("Mandarine.ts Organization"); // Returns `Mandarine.ts Organization` because value is null.

let frameworkName = "React";
Optional.of(frameworkName).orElseGet("Mandarine.ts"); // Returns `React` bacause value **is not** null;

let mySecondNullVariable = null;
Optional.of(mySecondNullVariable).get(); // Throws an error because value is not present/is null.

let companyName = "Amazon Inc.";
Optional.of(companyName).get(); // Returns `Amazon Inc.` because value is present.

let myThirdNullVariable = null;
Optional.of(myThirdNullVariable).orElseThrows(new Error("My custom error")); // Throws `Error: My custom error` because value is null.

let computerName = "Macbook Air";
Optional.of(computerName).orElseThrows(new Error("My custom error")); // Returns `Macbook Air` because value is present/ **not null**.