Setting up the variable i before the for loop will result in the output being 3 3 3.
let i;
for (i = 0; i < 3; i++) {
const log = () => {
console.log(i);
}
setTimeout(log, 100);
}
//Output 3 3 3
If i is declared within the for loop, the output will be 1 2 3:
for (let i = 0; i < 3; i++) {
const log = () => {
console.log(i);
}
setTimeout(log, 100);
}
//Output 1 2 3
By initializing i using let i = 0;, the scope of the variable i is limited to the block within the curly braces of the for loop.
If you declare i with let i; outside of the for loop, its scope is restricted to the block enclosing the for loop, not the actual for loop itself, resulting in the observed behavior.
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