Array API: Array.from()
Convert a not-array into an array.
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Array.from converts an array-like object or list into an Array
- call
Array.from with an array-like object
- a DOM node`s classList object can be converted
- convert a NodeList to an Array and
filter() works on it
custom conversion using a map function as second param
- we can modify the value before putting it in the array
- and we also get the object`s key as second parameter