Javascript Question: While Loop formatting?

Question

Have the following questions about this piece of code I created in Javascript:
var i = 100;
while (i>5)
{
 console.log (i);
 i--;
}
1) this code is supposed to countdown to greater than 5 from a 100.  However the console log spits out 6 twice.
2) How can I decrement in higher values than 5?
Thanks!

Jose Morales-Mendizabal · Answer

1) The code is spitting out twice the number 6 because your positioning the decrement operator -- in the wrong side of the operand (in your case, the variable i ). When you put the -- AFTER the variable " i " like you have it, it subtracts 1 from 100 on the first iteration of the loop but it RETURNS the undecremented value, thus 100. When it reaches the end of the loop it outputs 6 twice because it subtracts 1 from 6 but instead of outputting 5 it logs out the undecremented value of 6. To get to 5 place the -- operator BEFORE i. That way the loop will subtract 1 in each iteration but it will return the actual subtracted value that you want. 
2)  If you want to decrement in higher values you need to code your counter as 
``` javascript
i = i - x
//x being whatever value you want to decrement in. the counter below will count backwards 100, 90, 80 and so on
i = i - 10; 
```

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Alcibiades Montas

Alcibiades Montas

Javascript Question: While Loop formatting?

1 Answer

Jose Morales-Mendizabal

Jose Morales-Mendizabal