The World famous javascript interview question

Write your answers below.

Knowing the output is not that important, understanding why the output is important!

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Micro Learning ● Web Development ● Javascript ● MERN stack

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Comments

[Guilherme Oderdenge]

For each tick of your loop (5 ticks in total), it'll schedule console.log to be run with the value of i after 1000ms.

Meaning that in approximately ~1200ms (1000ms of the schedule plus some ms of the execution operation) after the execution of this code, the console will display 0, 1, 2, 3, 4.

Am I correct?

[Mehul Lakhanpal]

Good explanation but its wrong. var is scoped functionally and also because of closures, the value of i would be 5 when the cb is executed. Hence, it will print out

5
5
5
5
5

[Guilherme Oderdenge]

Ha! You got me! Thanks for clarifying!