Improving javascript code performance

Question

Assume you have a webapp with a 1000000 user logins in an hour.

and the following code get executed on each user login :

if (DevMode) {
    // make an Ajax call
} else if (RealMode) {
    // make other Ajax call
} else {
    // Do something else
}

Assuming that the DevMode login occurs only for 5% of the total user logins, is it more efficient to write the code as following:

 if (RealMode) {
    // make an Ajax call
} else if (DevMode) {
    // make other Ajax call
} else {
    // Do something else
}

Thanks

Either way, the amount of time spent by JavaScript in that will be absolutely minuscule and it won't make any noticeable difference. — Pointy
– Pointy, Commented Oct 16, 2016 at 14:35
Okay, so DevMode is only 5%. What's the other 95%? 95% RealMode and 0% neither? 5% RealMode and 90% neither? — T.J. Crowder
– T.J. Crowder, Commented Oct 16, 2016 at 14:37
In average you have like just 7 login connections per minute. Set aside your optimization case, you have enormous amount of time to handle them in every way you like. — Redu
– Redu, Commented Oct 16, 2016 at 14:41
if we assume I have 1,000,000 in an hour ? does that make a difference ? does avoiding doing multiple checks could improve performance ? — Jay
– Jay, Commented Oct 16, 2016 at 14:44

T.J. Crowder · Accepted Answer · 2016-10-16 14:36:33Z

1

Assuming that RealMode is the 95% case (you haven't actually said whether it's RealMode or else) then: Well, yes, because you avoid doing a check that will be false 95% of the time.

It won't matter that it's more efficient, though. Testing a variable for truthiness is really, really, really, really, really fast.

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