function findCommonElement <T> (array1: T[], array2: T[]) {
for (const a of array1) {
for (const b of array2) {
if (a === b) return a
}
return null
// Avoid conflict with other toArray() functions
function arrayify <T> (element: T | T[]) {
if (Array.isArray(element)) return element
return [ element ]
export {
findCommonElement,
arrayify