Lucas lucas-janon

## claimMissing.js
module.exports = (paramName) => {
  throw new Error(`Missing ${paramName}`)
}

## myBeautifulProgram.js
const claimMissing = require('./utils/claimMissing')
const fn = (importantParam = claimMissing('importantParam')) => {
  console.log(importantParam)
}

fn() // Error: Missing importantParam
fn('hello world') // hello world

## myHorribleProgram.js
const fn = (fnParam) => {
  if (!fnParam) throw new Error('Missing fnParam')
  ...
}
	module.exports = (paramName) => {
	throw new Error(`Missing ${paramName}`)
	}
	const claimMissing = require('./utils/claimMissing')
	const fn = (importantParam = claimMissing('importantParam')) => {
	console.log(importantParam)
	}

	fn() // Error: Missing importantParam
	fn('hello world') // hello world
	const fn = (fnParam) => {
	if (!fnParam) throw new Error('Missing fnParam')
	...
	}