Numbers:
const formatter = Intl.NumberFormat(LOCALE, { notation: 'compact' })

Currency:

Intl.NumberFormat(LOCALE, {
  notation: 'compact',
  style: 'currency',
  currency: 'ZWD'
})

It uses WebGL for it.

Another one !

Using JS to generate a default avatar with one letter:

function genAvatar(name) {
  try {
    // Match General_Category=Letter
    const match = name.match(/\p{L}/u);
    return (match && match[0]) || null;
  } catch {
    return name[0] || null;
  }
}

In the last 14 months (from Oct-2021 to Nov-2022), DevJobsScanner has analyzed more than 12M developer jobs.

1. JS/TS
2. Python
3. Java
4. C#
5. PHP
6. C/C++
7. Ruby
8. Go

How to handle fetch API errors ?
It throws on API Network Error only...

A curated list of algorithms sorted in two categories: Beginner and Advanced

Specific questions on the JS language

JavaScript Repository of TheAlgorithms, which implements various algorithms and data structures in JavaScript.

For education only

const productIds = [123, 456, undefined, 789]
const products = productIds
  .map(getProduct)
  .filter((item): item is Product => item !== undefined)

Would be my first pick to use in a JS environment

Often forgotten, it might be useful

import { v4 as uuidv4 } from 'uuid'

export const useId = () => {
  const prefix = uuidv4()

  const $id = (name: string) => `${prefix}-${name}`

  return { $id }
}

It can work with the crypto module too.

document.designMode controls whether the entire document is editable. Values are "on" and "off".

I learned about what WebDAV is on the way: https://en.wikipedia.org/wiki/WebDAV

Only 8KB gzipped! And fast installed with only one file :)

const moreInfos = { info: "Please go to the desk." }
return {
  address: "20B Rue Lafayette",
  postcode: "75009",
  ...(moreInfos !== undefined && { moreInfos })
}

In JavaScript, primitive values are Number, String, Boolean, Undefined, Symbol, and BigInt. Other data types are passed by reference, which means that the variable is given instead of just a copy. Modifications happen in-place.

An example of Weakmap: https://gist.github.com/PaulRosset/0d4e3a9b9af20f9997b41d15f70c8808#file-weak-map-js. Everything can be a key.

Clean code is not only concise code, but more importantly, it is readable. A rule of thumb when writing code, is to write code as if comments didn’t exist. The code should be self-explanatory.

• booleans should always have a prefix like "is", "has", or "was"

and other JS tips

The thing is some are already on https://1loc.dev/

Others can be added :)

A useful utility 👍

Unjs projects are definitely worth trying!