27 lines
491 B
Markdown
27 lines
491 B
Markdown
importance: 5
|
|
|
|
---
|
|
|
|
# What will setTimeout show?
|
|
|
|
In the code below there's a `setTimeout` call scheduled, then a heavy calculation is run, that takes more than 100ms to finish.
|
|
|
|
When the scheduled function will run?
|
|
|
|
1. After the loop.
|
|
2. Before the loop.
|
|
3. In the beginning of the loop.
|
|
|
|
|
|
What `alert` is going to show?
|
|
|
|
```js
|
|
let i = 0;
|
|
|
|
setTimeout(() => alert(i), 100); // ?
|
|
|
|
// assume that the time to execute this function is >100ms
|
|
for(let j = 0; j < 100000000; j++) {
|
|
i++;
|
|
}
|
|
```
|