Advanced JavaScript Training
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Callback Functions
Callback Functions
- Callback functions are functions passed as arguments to other functions. They execute when an asynchronous task is complete.
function readFileAsync(filename, callback) {
// Simulate file reading asynchronously
setTimeout(() => {
const fileData = 'This is the file content.';
callback(fileData);
}, 1000);
}
readFileAsync('example.txt', (data) => {
console.log('File content: ' + data);
});
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