Is Javascript synchronous(blocking) or Asynchronous(nonblocking) by default

Question

I am trying to grasp on Javascript Asynchronous functions and callbacks.

I got stuck on the concept of callback functions, where I am reading on some places: they ar

Answer 1

Javascript is always a synchronous(blocking) single thread language but we can make Javascript act Asynchronous through programming.

Synchronous code:

console.log('a');
console.log('b');

Asynchronous code:

console.log('a');
setTimeout(function() {
    console.log('b');
}, 1000);
setTimeout(function() {
    console.log('c');
}, 1000);
setTimeout(function() {
    console.log('d');
}, 1000);
console.log('e');

This outputs: a e b c d