@9oelm/maybe 中文文档教程

Question

maybe

npm i --save @9oelm/maybe

yarn add @9oelm/maybe

只是我个人用于处理 null 和 undefined 的工具。

Usage

import { maybe } from '@9oelm/maybe'

const mayBeNullOrUndefined: HTMLElement | null = document.querySelector('#maybe-exists');

const text: string = 
  maybe(maybeNullOrUndefined)
  .then(({ innerText }) => innerText)
  .otherwise(`please fill out text first`);

// omit .then to just receive the defined value itself
const someHTMLElementOrMyFallbackHtmlElement: HTMLElement = 
  maybe(mayBeNullOrUndefined).otherwise(document.createElement('div'))