x/tour: len(T) discussed before explaining

[KarthikNayak]

Context: https://tour.golang.org/moretypes/8

In this slide we have "// missing high index implies len(s)" before even
explaining what len(T) does. Although this is quite trivial, anyone new
to programming might not understand this.

[rakyll]

/cc @adg @campoy

[kytrinyx]

Since this is in a comment in the example, it's a bit tricky to explain it in the slide itself. Also, rewriting it to something else doesn't sit very well.

• // missing high index implies the rest of the slice - imprecise
• // missing high index implies the highest valid value, the length of the slice - wordy, imprecise

How about working around it by introducing len on the previous slide?

[kytrinyx]

Looking at this again, len(s) is even used on the previous slide (in the for loop), so it would be pretty straight forward to add a short description about this.

[rakyll]

I'd add a description for len saying it returns the length.

[adg]

@kytrinyx agree, let's mention len earlier.

[KarthikNayak]

Makes sense, a small description was what I was looking for. Thanks

On Thu, Oct 8, 2015, 8:07 AM rakyll notifications@github.com wrote:

I'd add a description for len saying it returns the length.

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#12758 (comment).

Regards,
Karthik