This content originally appeared on DEV Community and was authored by Coderslang: Become a Software Engineer
What will be logged to the console?
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
Before we analyze the code snippet, let’s try to simplify it by removing the setTimeout.
If we just leave the plain console.log in the loop, then the output is all the values of i from 0 to 4 printed on each iteration of the loop.
However, when the setTimeout is added, the console.log will be executed after the loop has already been processed and the value of i is 5.
As i was declared with var, it has the global scope and the intermediary values aren’t stored in closure around the arrow function () => console.log(i).
ANSWER: the value 5 will be printed on the screen 5 times. Each time on the new line.
This content originally appeared on DEV Community and was authored by Coderslang: Become a Software Engineer
Coderslang: Become a Software Engineer | Sciencx (2021-05-11T12:27:06+00:00) JavaScript Interview Question #39: How does setTimeout work inside the loop?. Retrieved from https://www.scien.cx/2021/05/11/javascript-interview-question-39-how-does-settimeout-work-inside-the-loop/
Please log in to upload a file.
There are no updates yet.
Click the Upload button above to add an update.