console.log('1'); setTimeout(() => console.log('2'), 0); Promise.resolve().then(() => console.log('3')); console.log('4');

The output will be:

1
4
3
2

Explanation:

• console.log('1') — synchronous call, outputs 1.
• setTimeout(..., 0) — places the function in the macro task queue, executed after the current stack and microtasks.
• Promise.resolve().then(...) — places the function in the micro task queue, which executes immediately after the current stack but before macro tasks.
• console.log('4') — synchronous call, outputs 4.

Execution order:

1. Synchronous code: 1, 4
2. Microtasks: 3
3. Macrotasks: 2