Web Reference: Jan 22, 2026 · JavaScript treats functions as first-class citizens, meaning they can be used just like any other value in the language. This capability makes JavaScript flexible, expressive, and powerful for modern web development. Functions can be assigned to variables and stored in data structures. Summary: in this tutorial, you’ll learn that JavaScript functions are first-class citizens. This means that you can store functions in variables, pass them to other functions as arguments, and return them from other functions as values. Jul 18, 2025 · A programming language is said to have First-class functions when functions in that language are treated like any other variable. For example, in such a language, a function can be passed as an argument to other functions, can be returned by another function and can be assigned as a value to a variable.
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