You should probably also mention that
for (let i = 1; i <= 3; i ++) setTimeout(() => console.log(i), 100);
gets you 1 2 3, whereas
1 2 3
for (var i = 1; i <= 3; i ++) setTimeout(() => console.log(i), 100);
will output 4 4 4. IMO this is one of the major reason why scope of loop variable matters.
4 4 4
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You should probably also mention that
gets you
1 2 3, whereaswill output
4 4 4. IMO this is one of the major reason why scope of loop variable matters.