[HELP] Lua "and"

[smurfier]

The tutorial isn't actually being very helpful on how to use "and". This is what I'm failing at:

Code: Select all

   if Length<=Width and Mode=2 then
      Int = 0
   else
      Int = 1
   end

[jsmorley]

It isn't the "and" that is giving you trouble here, it is the fact that you are using an assignment operator "=" when you mean to use a comparison operator "==" in "Mode=2".

[Yggdrasil]

A shorter&faster way to use these kind of codes:

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Int = (Length<=Width and Mode==2) and 0 or 1

[smurfier]

Tee hee... Rainmeter has me spoiled.

Also... Didn't know I could do it that way. I thought that in lua they evaluate to true or false.

[jsmorley]

A shorter&faster way to use these kind of codes:

Code: Select all

Int = (Length<=Width and Mode==2) and 0 or 1

Right. Lua "shorthand" stuff is very cool, but to be honest I'm glad it also works in a more "basic" syntax structure to initially be a bit more accessible for new users. Lets someone who isn't a programmer wrap their head around it a bit quicker. I do suggest that anyone who wants to really get better at this Lua stuff take a look at the "shortcuts" that Lua has. They are clever indeed. They can reduce code, and although in the little scripts we are writing for Rainmeter a few cycles either way is not going to generally make any difference, they can be more efficient.

[Yggdrasil]

In conditions, nil and false is false, everything else is true (so 0 is true) By the way, the result of a comparison is always a boolean (true/false)

[smurfier]

Could you please explain the shorthand a bit, I haven't gotten that far into my understanding yet. I'm a basic scripter as most of my experience lies with writing basic for my TI-89 back in high school.

[jsmorley]

See what I meant in my PM smurfie?

[jsmorley]

Could you please explain the shorthand a bit, I haven't gotten that far into my understanding yet. I'm a basic scripter as most of my experience lies with writing basic for my TI-89 back in high school.

I'm no expert, I'm just starting to wrap my head around a lot of it myself, but this page has some good info on how "expressions" can be efficiently written.

http://lua-users.org/wiki/ExpressionsTutorial

[smurfier]

I understand your PM, I just wanted to hide my "duh" moment behind closed doors.

I just need to understand that particular like of shorthand because I feel really bad "publishing" a line of code that I don't understand. Also, I've been reading the tutorial, I'm just one that needs to learn things the hard way.