Great question. The reason we can spread an array with no index keys is because spread's implementation doesn't require that any index keys exist, unlike map. It blindly loops from 0 to 99, asks the array for array[index], and places whatever's returned in the new array.
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I think my question is out of the scope of the topic, but:
When we do:
Array(100);If there are no index keys in the object representation of the array (the object is a vacuum), why we can spread it?? 🤯
const arr = [...Array(100)]Thank you for this interesting post!
Salute from 🇦🇷!
Great question. The reason we can spread an array with no index keys is because spread's implementation doesn't require that any index keys exist, unlike map. It blindly loops from 0 to 99, asks the array for array[index], and places whatever's returned in the new array.