Intersperse items, including React elements, with a separator.

intersperse.ts

/**
 * Modified from Sophie's StackOverflow answer here:
 * https://stackoverflow.com/questions/23618744/rendering-comma-separated-list-of-links
 */

function intersperse<T>(arr: T[], sep: any) {
  if (arr.length === 0) {
    return [];
  }

  return arr.slice(1).reduce((acc, el) => acc.concat([sep, el]), [arr[0]]);
}