What is the difference between synchronous and asynchronous code?

Description : Synchronous code is executed sequentially, while asynchronous code allows other operations to continue while waiting for tasks to complete.

Answer :

Synchronous code is executed line by line, with each operation waiting for the previous one to complete before proceeding. Asynchronous code, on the other hand, allows certain operations to continue running in the background without blocking the execution of subsequent code. This is typically managed with callbacks, promises, or async/await, enabling more efficient use of time, especially for operations like network requests, file I/O, or timers. 

console.log('Synchronous');

setTimeout(() => {
  console.log('Asynchronous');
}, 1000);

console.log('Still synchronous');

// Output:
// Synchronous
// Still synchronous
// Asynchronous (after 1 second)

Synchronous code is executed line by line, with each operation waiting for the previous one to complete before proceeding. Asynchronous code, on the other hand, allows certain operations to continue running in the background without blocking the execution of subsequent code. This is typically managed with callbacks, promises, or async/await, enabling more efficient use of time, especially for operations like network requests, file I/O, or timers. 

console.log('Synchronous');

setTimeout(() => {
  console.log('Asynchronous');
}, 1000);

console.log('Still synchronous');

// Output:
// Synchronous
// Still synchronous
// Asynchronous (after 1 second)

Category : Javascript

Created Date : 9/6/2024

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