Local variable to global variable in JS for loop, value changed after loop ends

Question

Curious about why i becomes 5 in the end?

for (var i = 0; i < 5; i++) {
  console.log('A: ', i);
}
console.log('B: ', i);

`i = 4` -> `i < 5 === true` -> `console.log('A: ', i);` -> `i++` -> `i = 5` -> `i < 5 === false` -> end loop. — VLAZ, Jun 23 '20 at 09:09
var i gets hoisted. It's equivalent to var i; for(i=0;i<5;i++) console.log(i); console.log(i) — user120242, Jun 23 '20 at 09:09
because at end it becames 5 and the condition becomes false and it breaks and console.log B where I = 5 — xMayank, Jun 23 '20 at 09:10
@NinaScholz How do you guys find these dupes? Makes me feel like I don't know how to use Google anymore — user120242, Jun 23 '20 at 09:12

score 3 · Accepted Answer · answered Jun 23 '20 at 09:09

3

i++ increases the value of i at the end of each loop.

The loop goes round until the condition (that i is 4 or less) isn't true.

When i is 5, that is the first time the condition isn't true.

answered Jun 23 '20 at 09:09

Quentin

1 Answers1