rambda/src/flatten.js

Lightweight and faster alternative to Ramda with included TS definitions

import { isArray } from './_internals/isArray.js'

export function flatten(list, input) {
  const willReturn = input === undefined ? [] : input

  for (let i = 0; i < list.length; i++) {
    if (isArray(list[i])) {
      flatten(list[i], willReturn)
    } else {
      willReturn.push(list[i])
    }
  }

  return willReturn
}