学ぶ What Are Functions? | Understanding and Writing Functions

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When you write code, you often need to perform the same task more than once or organize your logic into manageable pieces. In programming, a function is a named block of code that performs a specific task.

Functions exist to help you break down complex programs into smaller, reusable parts. By grouping related statements together, functions make your code easier to read, debug, and maintain. Instead of repeating the same lines of code in multiple places, you can define a function once and use it wherever you need that behavior.

This not only saves time but also helps prevent mistakes and makes programs more organized.


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// This function prints a greeting message to the console
function sayHello() {
  console.log("Hello, world!");
}

// Call the function to see the greeting
sayHello();

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