SakoMe

'use strict';

/**
 * Shape class.
 *
 * @constructor
 * @param {String} id - The id.
 * @param {Number} x  - The x coordinate.
 * @param {Number} y  - The y coordinate.
 */

SakoMe

// Functional JS to flatten an array...

const flatten = (array) => {
  return array.reduce((flat, toFlatten) => {
    return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
  }, []);
}

console.log(flatten([[1,2,[3]],4])); 

SakoMe

//SET UP

const users = [{
  id: 1,
  name: 'Bob',
  schoolId: 101
}, {
  id: 2,
  name: 'Jane',
  schoolId: 999