While Loop Logic

Question

I just have a question about some while loop logic. So, when you write a loop that displays a string of numbers to a document and say that while the loop is <= (less than or equal to) say, 5, and you tell the loop to add 1 each time this is true, wouldn't that mean that: while the loop is equal to 5 that it would add one to 5 too? It doesn't, but I messed up on some code when I was practicing and noticed that when it is equal to five it does not add one, but I thought it would...

console.log('2nd Loop:');
text = '';

// loop:
i = 1; 
while (i <= 5) {
  text += i + ' ';
  i += 1
}

console.log(text); // Should print `1 2 3 4 5 `.

It does work for me. Could you elaborate on what is the output you are getting. Could you explain what is not working for you? — Sriraghavan Subramanian
– Sriraghavan Subramanian, Commented Aug 17, 2017 at 16:13

Erin · Accepted Answer · 2017-08-17 16:16:24Z

2

the reason your text doesn't display a 6 isn't because i isn't incremented. It's because the text gets added onto before it's incremented.

In other words when executing on that 5th loop, the text would add on 5, and then it would increment i, and then it would check the loop again, which would no longer be valid and therefore 6 is never printed.

answered Aug 17, 2017 at 16:16

Erin

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Ezenhis · Accepted Answer · 2017-08-17 16:14:44Z

0

In memory, it adds one. It doesn't add it to the text though.

Since you're incrementing the value after assigning it and then the loop condition fails, it doesn't get to the part where you concatenate the string.

answered Aug 17, 2017 at 16:14

Ezenhis

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j08691 · Accepted Answer · 2017-08-17 16:14:49Z

0

It does. Just output i and you'll see it's 6. text never gets the 6 because of when you increment i.

console.log('2nd Loop:');
text = '';

// loop:
i = 1; 
while (i <= 5) {
  text += i + ' ';
  i += 1
}

console.log(text,i); // Should print `1 2 3 4 5 `.

answered Aug 17, 2017 at 16:14

j08691

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1 Comment

j08691 Over a year ago

@hannacreed You don't see 6 in the snippet above? What browser are you using?

aahhaa · Accepted Answer · 2017-08-17 16:20:17Z

0

b/c you +1 after you add i to text, all you need to do is switch the two line order.

EDIT if you want it start with one just change your i to 0 to start with.

i = 1 

    console.log('2nd Loop:');

    text = '';

    i = 0; 
    while (i <= 5) {
      i += 1
      text += i + ' ';
    }

    console.log(text);

edited Aug 17, 2017 at 16:20

answered Aug 17, 2017 at 16:18

aahhaa

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1 Comment

Erin Over a year ago

that would cause it to start printing out at 2 though.

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