fix(pickOne): return undefined on empty array

src/array-pick-one.ts

@@ -4,6 +4,5 @@
  * @returns item like : "pine"
  */
 export function pickOne<T> (items: T[]) {
-  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
-  return items[Math.floor(Math.random() * items.length)] as T
+  return items[Math.floor(Math.random() * items.length)]
 }

tests/arrays.test.ts

@@ -6,7 +6,9 @@ const elementsShuffled = shuffleArray(elements)
 it('shuffle an array does not affect the original one', () => { expect(elementsShuffled).not.toStrictEqual(elements) })
 
 const elementPicked = pickOne(elements)
-it('pick one returns an element from the array', () => { expect(elementPicked && elements.includes(elementPicked)).toStrictEqual(true) })
+const isUndefinedPicked = pickOne([false].filter(Boolean))
+it('pick one returns an element from the array', () => { expect(elementPicked !== undefined && elements.includes(elementPicked)).toStrictEqual(true) })
+it('pick one returns undefined', () => { expect(isUndefinedPicked).toBeUndefined() })
 
 it('array unique A', () => { expect(arrayUnique([1, 1, 2, 1, 1, 3, 1])).toStrictEqual([1, 2, 3]) })
 it('array unique B', () => { expect(arrayUnique(['plop', 'plop', 2, 'plop', 'plop', 3, 'plop'])).toStrictEqual(['plop', 2, 3]) })