Forem: Andrii Fedyk

Why inline events handler are bad in HTML and good in React?

Andrii Fedyk — Tue, 29 Jul 2025 05:34:10 +0000

Since you are a baby developer, always say don't use inline event handlers:

Event mdn says don't use those.

But in React, inline event handlers are fine:

<button onClick={bgChange}>Press me</button>

Why?

Node.js built-in alternative to nodemon

Andrii Fedyk — Sat, 31 Aug 2024 08:50:30 +0000

Node.js built-in alternative to nodemon

The nodemon is a popular library for running and restarting Node.js processes on file changes. All LTS Node.js support an option --watch-path, which allows to replace nodemon:

// before
nodemon --inspect ./server.js

// after
node --inspect --watch-path=./ ./server.js

More details can be found here https://nodejs.org/api/cli.html#--watch-path.

Go errors handing in JavaScript

Andrii Fedyk — Fri, 22 Apr 2022 14:17:37 +0000

For exceptions, try...catch is the way to go in JS. By introducing async/await, we can use the try...catch statement for asynchronous code as well:

let greeting

try {
  greeting = await helloAsync("World")
}
catch(err) {
  greeting = "Hello World"
}

console.log(greeting)

async function helloAsync(name: string): string {
  if (name === "") {
    throw new RangeError("`name` can't be empty")
  }

  return `Hello ${name}`
}

The code is not the most elegant. When you have more "try...catches" in code, it becomes less readable. It's easier to assume that code is "perfect" and skip error handling. As a result, many developers are scared of using throw new Error().

After spending some time with golang, I'm amazed how well the language is designed in this matter. Inspired by golang, I have created a simple utility called go which drastically simplify the error handling:

function go<T>(promise: T) {
  return Promise.resolve(promise)
    .then(result => [null, result] as const)
    .catch(err => [err, null] as const)
}

Here the example from the begging:

let [err, greeting] = await go(helloAsync("Andrii"))

if (err) {
  greeting = "Hello World"
}

console.log(greeting)

Take care, and watch for the errors!