This does not create a "normal" JavaScript object literal (aka map, aka hash, aka dictionary). It is however creating the structure that OP asked for (and which is illustrated in the other question …

How to iterate (keys, values) in JavaScript? [duplicate] Asked 9 years, 9 months ago Modified 4 years ago Viewed 1.2m times

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That is actually a JavaScript object, associative arrays do not exist in JavaScript.

May 10, 2017 · How can I get a collection of keys in a JavaScript dictionary? [duplicate] Asked 13 years, 5 months ago Modified 5 years, 3 months ago Viewed 368k times

Feb 12, 2019 · @Dominic either way, there's actually a sound technical reason to recommend against the Object.keys method, and that is since the values are not passed to the .map call …

May 23, 2017 · Most JavaScript engines use a dictionary-like data structure as storage for object properties - each property access requires a dynamic lookup to resolve the property's location …

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