let a = 5; setTimeout(function timeout() { //macro console.log(a); a = 10; }, 0); let p = Promise.resolve().then(data => { console.log(a); a = 25; resolve(); }).then() console.log(a); // 5 25 25

Let's analyze the order of output values in this code:

let a = 5;

setTimeout(function timeout() { // macro task
  console.log(a); // 25
  a = 10;
}, 0);

let p = Promise.resolve().then(data => { // micro task
  console.log(a); // 5
  a = 25;
}).then();

console.log(a); // 5

Explanation:

1. First, all synchronous code is executed, so console.log(a); outputs 5.
2. Then, microtasks (Promise) are executed, where console.log(a); will output 5, and then a will change to 25.
3. After microtasks, macrotasks (setTimeout) are executed, where console.log(a); will output 25, since a was changed in the microtask.

The final output will be:

5
5
25

In your example, the output is indicated as 5 25 25, which does not match the actual order. There might be an error in the comments or in understanding the event loop's order of events.