Copy edit & link to cheatsheet codelab

[kwalrath]

Fixes #1619

Staged:
https://kw-www-dartlang-1.firebaseapp.com/codelabs
https://kw-www-dartlang-1.firebaseapp.com/codelabs/dart-cheatsheet

[kwalrath]

@RedBrogdon it occurred to me that we should include the actual cheatsheet in this codelab — or link to another page that's just the cheatsheet. What do you think?

[kwalrath]

It also occurred to me that we should be clearer up front about the audience. If it includes beginning Dart developers, then we should offer more help with the API. (Maybe we should do that even if we explicitly don't want Dart learners.)

[RedBrogdon]

One tiny nit, which you're free to ignore.

Thanks again for doing this. Now that I'm done traveling for a while, you shouldn't have to wait this long for an LGTM.

[RedBrogdon]

nit: "example usages" of string interpolation?

[RedBrogdon]

@RedBrogdon it occurred to me that we should include the actual cheatsheet in this codelab — or link to another page that's just the cheatsheet. What do you think?

Good idea. My vote would probably be for a separate page, since the "I want to quickly scan and remind myself of the list of features" and "I want to actively practice those features" audiences would likely be pretty distinct.

[kwalrath]

@RedBrogdon it occurred to me that we should include the actual cheatsheet in this codelab — or link to another page that's just the cheatsheet. What do you think?

Good idea. My vote would probably be for a separate page, since the "I want to quickly scan and remind myself of the list of features" and "I want to actively practice those features" audiences would likely be pretty distinct.

OK, I'm going to update this PR with that page, so that the name makes sense.

[kwalrath]

I've uploaded the cheatsheet page but haven't put it in the sidenav, for a couple of reasons:

• I'm not crazy about how I formatted it. I'd like it to be visible in a single page, but that'd take a while to make happen.
• There's not a one-to-one correspondence between items covered in the cheatsheet and the items covered in the codelab. I'd like to make them agree more.

I've updated the staging server:

https://kw-www-dartlang-1.firebaseapp.com/codelabs
https://kw-www-dartlang-1.firebaseapp.com/codelabs/dart-cheatsheet
https://kw-www-dartlang-1.firebaseapp.com/guides/language/cheatsheet

/cc @mehmetf

[RedBrogdon]

LGTM. I added a couple minor suggestions, but that's about all I have to offer here. I imagine you'll think of other things to add down the line.

I definitely deviated from the original cheatsheet a few times when I thought I had an idea for a codelab exercise that was within the spirit of the doc and would be a good test for DartPad. I wouldn't worry about being faithful to the codelab contents, therefore, unless you really want to.

[RedBrogdon]

Might be good to mention sets in here as well.

[RedBrogdon]

Mention that on and catch can be used together?

[kwalrath]

I'm going to merge this and put your suggestions for the cheatsheet in a new issue. Thanks for the content and the reviews!