The answer
'function'. Functions are a distinct type, but under the hood they are callable objects. They can even have their own properties, though this is rarely useful.
Functions as First-Class Citizens in JavaScript
What is typeof for a function in JavaScript?
More FAQs in Functions as First-Class Citizens in JavaScript
Functions are treated like any other value. They can be assigned to variables, passed as arguments, returned from other functions, stored in data structures, and have a type (typeof is 'function').
Yes. Passing functions as arguments is how callbacks work. setTimeout, map, filter, fetch.then, and event listeners all accept functions as arguments.
Yes. A function that returns another function is called a higher-order function. The returned function often captures the outer variable environment, creating a closure.
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