Web Reference: Declare a function that outputs "Hello World" when it is called: document.getElementById("demo").innerHTML = "Hello World!"; More examples below. The function statement declares a function. A declared function is "saved for later use", and will be executed later, when it is invoked (called). The function declaration creates a binding of a new function to a given name. Jan 16, 2026 · In JavaScript, functions are blocks of reusable code designed to perform a specific task. Understanding how to declare and invoke (call) functions is fundamental to writing efficient and maintainable code.
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