@chrock/optional v0.3.2

@chrock/optional

@chrock/optional是一个工具模块，用于提供其他语言中的Optional类型，以及一些相关的操作。\ @chrock/optional is a utility module that provides an Optional type like in other languages, and some related operations.

使用示例 Example

• Optional.of

  import { Optional } from '@chrock/optional';
  
  const optional = Optional.of(1);
  console.log(optional.value); // <- 1

• Optional.map

  import { Optional } from '@chrock/optional';
  
  const optional = Optional.of(1);
  const mapped = optional.map((v) => (v + 1));
  console.log(mapped.value); // <- 2

• 使用also进行副作用操作\ Perform side effects with also

  import { Optional } from '@chrock/optional';
  
  const optional = Optional.of(1);
  optional.also((v) => console.log(v)); // <- 1
  
  const empty = Optional.empty();
  empty.also((v) => console.log(v)); // <- 永远不会执行，因为`Optional.value`为`undefined`

• 使用getOrElse获取值或默认值\ Get value or default value with getOrElse

  import { Optional } from '@chrock/optional';
  
  const optional = Optional.of(1);
  console.log(optional.getOrElse(0)); // <- 1
  
  const empty = Optional.empty();
  console.log(empty.getOrElse(0)); // <- 0

• 使用Optional.of进行某些初始化操作 Using Optional.of for some initialization operations

  import { Optional } from '@chrock/optional';
  
  class WithOptional {
    el: HTMLElement = Optional.of(document.createElement('div')).map((el) => {
      el.innerText = 'Hello, World!';
      el.classList.add('container');
      el.addEventListener('click', () => {
        console.log('Clicked!');
      });
      return el;
    }).value;
  }
  
  const withOptional = new WithOptional();
  document.body.appendChild(withOptional.el);