JavaScript’s reduce is one of the ... If the current value accepted by the callback is an array, as verified using the isArray method, we recursively call the flattenArray function on it.

So lets, start with simple one Array.isArray() method. The Array.isArray() method is static method determines whether the passed value is an Array. Well, remember whenever you are stuck with problem ...

Array limitations in MobX 4 and below Due to limitations of native arrays in ES5 observable.array will create a faux-array (array-like object) instead of a real array. In practice, these arrays work ...