Javascript debugging confusion

JavaScript
1

Curious:

if != implys that the initialized is unequal to 4 and it creates an infinite loop, then why does >=4 (init greater than four) resolute to “undefined” and does not create any loop, whereas <=4 (init 1, true statement) creates an ending loop… shouldn’t any False condition create an infinite loop?


function myFunc() {
for (let i = 1; i = 4; i += 2) {
  console.log("Still going!");
}
}

console.log(myFunc());

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36

Challenge: Prevent Infinite Loops with a Valid Terminal Condition

Link to the challenge:

2

!= 4 will always be false. <= 4 must eventually be true.

1 Like
3

Also, it’s doesn’t test if it equals 4, it sets it to 4.

2 Likes
4

so it is a matter of syntax? operator != being on par with strict inequality?

& therefore linguistically, i=1, >=4, doesn’t meet loop conditions even though the logic of the value negates the need for repetition in the loop?

i am just confused as to how (!=) doesnt equal whats natively unequal (1>4=)… and does such a syntax take precedent in all of JS or just for loops?

5

This has nothing to do with strictness.

With the loop

for (let i=1; i!=4; i+=2) {
  console.log("i=", i);
}

do you ever have i set to 4?

With the loop

for (let i=1; i<=4; i+=2) {
  console.log("i=", i);
}

what values do you see?

With the loop

for (let i=1; i>=4; i+=2) {
  console.log("i=", i);
}

what do you see?

The loop body is executed so long as the condition is true.

1 Like
6

for (let i=1; i!=4; i+=2) {
console.log(“i=”, i);
}

So if loops are made when conditions are True, may I ask how the given != creates a loop although it is as false as >=4, shouldn’t any number greater than 1 be regarded as != as well?

condition >=4 registers undefined in the terminal and not an infinite loop as is declared with the condition !=, is it a limitation of the FCC terminal?

7

console not terminal.

8

Did you run the code I provided? Did you look at the values printed out?

i!=4 is always true in the first loop. i>=4 is never true.

It has nothing to do with FCC. The two loops work the same everywhere.

9

ok, thanks alot for the clarification.

It is nice to meet you Dungeon Master!

i’m Dez, i am quite novice so expect to hear plenty from me! :sweat_smile:

1 Like
10

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