npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

js-dynamic-function

v0.0.3

Published

动态函数,类似于多态函数,但不限于按参数类型条件切换执行体

Downloads

10

Readme

DynamicFunction

动态函数,类似于多态函数,但不限于按参数类型条件切换执行体


简介

定义

动态函数是一种特殊的函数,在函数执行前,需要先调用 getExecutor 方法获取函数执行体,如果获得的执行体为非函数,则动态函数将不执行

同时,动态函数拥有一个方法 isExecutable 用以检测动态函数是否可以被执行

声明方式

new DynamicFunction(getExecutor)
// or
new DynamicFunction(name, getExecutor)
// or
new DynamicFunction({ name, getExecutor })

示例

let flag = false

const fn = new DynamicFunction(() => {
  if (!flag) {
    return null
  }

  return (a, b) => a + b
})

fn.isExecutable() // false
fn(1, 2) // nothing happen

flag = true
fn.isExecutable() // true
fn(1, 2) // 3

flag = false
fn.isExecutable() // false
fn(1, 2) // nothing happen

异步

getExecutor 函数为异步,则其执行过程及相关方法均为异步


var delay = time => new Promise(resolve => setTimeout(resolve, time))

var fn = new DynamicFunction(async () => {
  await delay(1000)

  return function test(a, b) {
    return a + b
  }
})

await fn(1, 2) // log '3' after 1000 ms
await fn.isExecutable() // log 'true' after 1000 ms
await fn.getName() // log 'test' after 1000 ms
await fn.getLength() // log '2' after 1000 ms

其他

名字

显式声明函数名

var fn = new DynamicFunction('test', () => {...})

// or

var fn = new DynamicFunction({
  name: 'test', 
  getExecutor: () => {...}
})

fn.getName() // test

若未显式声明函数名,则使用 executor 的名称

var fn = new DynamicFunction(() => {
  return function test() {...}
})

fn.getName() // test

参数个数 / 长度

无法显式声明,使用 executor 的长度

var fn = new DynamicFunction(() => {
  return function test(a, b) {...}
})

fn.getLength() // 2