Prompt Detail:
A function is considered a "first-class" function in JavaScript if it can be treated like any other value, such as a variable, object, or array. This means that it can be assigned to a variable, passed as an argument, and returned from another function.
So, in short, a function being assignable to a variable is enough to qualify it as a first-class function in JavaScript. The ability to pass a function as an argument and return a function from another function are additional features that are possible with first-class functions, but not necessary to qualify a function as first-class.
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