utils/array-utils/src/flatten.js

  1. /**
  2.  * Flatten the given array into a single array of elements.
  3.  * The given array can be composed of multiple depths of objects and or arrays.
  4.  * @param {Array} array - array to flatten
  5.  * @returns {Array} a flat array with a single list of elements
  6.  * @alias module:array-utils.flatten
  7.  * @example
  8.  * const flat = flatten([[1], [2, 3, [4, 5]], 6]) // returns [1, 2, 3, 4, 5, 6]
  9.  */
  10. const flatten = (arr) => arr.reduce((acc, val) => Array.isArray(val) ? acc.concat(flatten(val)) : acc.concat(val), [])
  12. module.exports = flatten