for (var i = 0; i < 3; i++)

operations:

setTimeout(..., 100)

$i = 3$

#0 $\text{() } \Rightarrow \text{console.log}(i)$

#1 $\text{() } \Rightarrow \text{console.log}(i)$

#2 $\text{() } \Rightarrow \text{console.log}(i)$

for (let i = 0; i < 3; i++)

operations:

setTimeout(..., 100)

$i_0 = 0$

$i_1 = 1$

$i_2 = 2$

#0 $\text{() } \Rightarrow \text{console.log}(i_0)$

#1 $\text{() } \Rightarrow \text{console.log}(i_1)$

#2 $\text{() } \Rightarrow \text{console.log}(i_2)$