Applying Array.flat() without any value will only flat a provided array up to one level. In the provided example you have an array with 2 nesting levels. Thus, the result should be [1, 2, 3, 4, [5, 6]].
If you know the number of nesting arrays you can provide it (e.g. list.flat(2)), otherwise you can use global property Infinity with it (e.g. list.flat(Infinity)) which will flat all number of nesting arrays.
Thus your example might be rewritten in the following way
Array flat example has a wrong result.
Applying
Array.flat()without any value will only flat a provided array up to one level. In the provided example you have an array with 2 nesting levels. Thus, the result should be[1, 2, 3, 4, [5, 6]].If you know the number of nesting arrays you can provide it (e.g.
list.flat(2)), otherwise you can use global propertyInfinitywith it (e.g.list.flat(Infinity)) which will flat all number of nesting arrays.Thus your example might be rewritten in the following way
My bad, Thank you so much for pointing it out.