Oke, Case can be closed.
Roelof
Op zondag 28 december 2014 05:21:03 UTC+1 schreef ryandesign:
>
> > On Dec 27, 2014, at 1:34 PM, Roelof Wobben wrote:
> >
> > Oke
> >
> > Let's say it a one and one logging purpose.
>
> I don't understand.
>
>
> >> var example = "example string"
> >> console.log(example.length);
> >>
> >> Is this valid and good javascript
>
> This is fine.
>
>
> >> or can I better use a variable for the length and use that on
> console.log ?
>
> If your JavaScript will run in an old web browser with a slow and/or
> poorly-optimized JavaScript engine (old versions of Internet Explorer,
> especially), and you will be using the length of the string repeatedly (in
> a loop, for example), then you can get slightly better performance by using
> an intermediate variable:
>
> var example = "example string";
> var exampleLength = example.length;
> for (var i = 0; i < 10; ++i) {
> console.log(exampleLength);
> }
>
> But don't worry about those kinds of micro-optimizations when first
> learning JavaScript, and don't worry about them at all for modern
> JavaScript engines like the v8 engine found in Google Chrome and in nodejs.
>
> Using intermediate variables for properties you use in several places in
> code can also reduce the size of your code when minified, but that's
> another micro-optimization, and only applicable if the code will be sent
> over the wire to a web browser, and not applicable for server-side code
> running under nodejs for example.
>
>
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