Js Map With Index. Prior to jQuery 16 map supports traversing arrays only. The index is used inside map method to state the position of each element in an array but it doesnt change the original array.
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FilteredNumbers is 1 2 3 undefined numbers is still 1 2 3 4. The map method calls the provided function once for each element in an array in order. If you pass the contextObject to the map method you can reference the contextObject inside the callback function using the this keyword.
Thats the same because ObjectfromEntries expects an iterable object as the argument.
To use the map function attach it to an array you want to iterate over. The index is used inside map method to state the position of each element in an array but it doesnt change the original array. FilteredNumbers is 1 2 3 undefined numbers is still 1 2 3 4. In JavaScript map method handles array elements which creates a new array with the help of results obtained from calling function for each and every array element in an array.
