Understanding Callback Functions in JavaScript
Callback is a function that is passed as an argument to another function, and is executed at a later time. The calling function passes control to the called function, which performs some operation, and then returns control back to the calling function.
In other words, a callback is a function that is called by another function after it has completed its own execution. The callback function can be used to perform additional tasks or to provide additional information to the calling function.
Here is an example of how a callback might be used:
```
function doSomething(callback) {
// Perform some operation
console.log("Doing something...");
// Call the callback function
callback();
}
function doSomethingElse() {
// Perform some other operation
console.log("Doing something else...");
// Call the doSomething function with a callback
doSomething(function() {
console.log("Callback called!");
});
}
```
In this example, the `doSomething` function takes a callback function as an argument. When the `doSomething` function is called, it performs some operation and then calls the callback function. The `doSomethingElse` function calls the `doSomething` function with a callback function that logs a message to the console.
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