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In JavaScript, first-class functions(first-class citizens) mean that functions are treated like any other variable. That means:
1. You can assign a function to a variable.
2. You can pass a function as an argument to another function.
3. You can return a function from another function.
This capability enables powerful patterns like callbacks, higher-order functions, event handling, and functional programming in JavaScript.
For example, the handler function below is assigned to a variable and then passed as an argument to the addEventListener method.
javascript
1const handler = () => console.log("This is a click handler function");
2
3document.addEventListener("click", handler);Advertisement
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JavaScript Coding Exercise 12
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