Why is the for loop not working?

Question

I'm sure this has something to do with that it's nearly 5 AM...and that I'm missing something obvious.

Here is my code:

var dayInMonth = 2,
    lastDayNum = 30;

console.log(dayInMonth, (dayInMonth > lastDayNum)); // displays "2 false"

for(dayInMonth; dayInMonth > lastDayNum; dayInMonth++){
    console.log("here!") // not displaying anything
}

What is stopping the for loop from executing theconsole.log() statement?

Obviously dayInMonth > lastDayNum is false, i.e 2<30.... Take a nap and try again — pankar
– pankar, Commented Sep 14, 2012 at 8:57
Thank you everyone! The perils of programming on coffee and no sleep... — dmr
– dmr, Commented Sep 14, 2012 at 8:59
+1 as you don't deserve to lose rep for being tired. Go to sleep. — SpaceBeers
– SpaceBeers, Commented Sep 14, 2012 at 9:01

Alex K. · Accepted Answer · 2012-09-14 08:59:42Z

1

Wrong logical test (< rather than >);

for(; dayInMonth < lastDayNum; dayInMonth++){
    console.log("here!") // not displaying anything
}

answered Sep 14, 2012 at 8:59

Alex K.

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Stefan · Accepted Answer · 2012-09-14 08:57:26Z

1

dayInMonth > lastDayNum will never be greater

answered Sep 14, 2012 at 8:57

Stefan

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xdazz · Accepted Answer · 2012-09-14 08:57:41Z

1

dayInMonth > lastDayNum should be dayInMonth <= lastDayNum, right?

answered Sep 14, 2012 at 8:57

xdazz

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SpaceBeers · Accepted Answer · 2012-09-14 08:57:58Z

1

for(dayInMonth; dayInMonth < lastDayNum; dayInMonth++){
    alert("here!") // not displaying anything
}

You want < not >.

answered Sep 14, 2012 at 8:57

SpaceBeers

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Philipp · Accepted Answer · 2012-09-14 08:58:25Z

1

Try

dayInMonth < lastDayNum

A for loop is executed as long as the second parameter is true, not until it's false.

answered Sep 14, 2012 at 8:58

Philipp

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Cosmin · Accepted Answer · 2012-09-14 08:59:07Z

1

var dayInMonth = 2,
    lastDayNum = 30;

console.log(dayInMonth, (dayInMonth > lastDayNum)); // displays "2 false"

for(dayInMonth; dayInMonth < lastDayNum; dayInMonth++){
    console.log("here!") // not displaying anything
}

Inside for <, not >

answered Sep 14, 2012 at 8:59

Cosmin

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