The world needed another JavasScript array flattening function

dmrflatten.js

/**
 * Flatten a JavaScript array
 * @param {Array} arr Array to flatten
 * @param {number} depth Levels deep to flatten
 * @return Array
 */
export default function flatten(arr, depth = 1) {
  if(depth === 0) return arr
  let newArr = []
  arr.forEach((x) => {
    newArr = newArr.concat(x instanceof Array ? flatten(x, depth - 1) : [x])
  })
  return newArr
}

package.json

{
  "name": "dmrflatten",
  "version": "0.1.1",
  "main": "dmrflatten.js"
}