Learning Ruby by Writing a Working Shell?

matt.gordon320

Hi Devs,

A while back, I tried to start working on a script to create spot elevation markers here http://sketchucation.com/forums/viewtopic.php?f=180&t=51558, which turned out to be far too ambitious for my limited knowledge of ruby. So here's what I'd figuring I'll start doing to write my plugin(s).

I'm going to start by creating the menus, the organization, and extension information, and get that working in SketchUp first, essentially just as a proof of concept. If I can just get the plugin working as a working "shell" as it were, I can then replace the methods calling Messages Boxes with actual working methods.

So as my first question: What is causing the script to only return "You clicked YES!" instead of the expected response? [Line 24-29]

Here's the GIT for those of you that want it:https://github.com/mattgordon320/GB_Tools.git

Let me know what you think and that'll get me a start!

Thanks gents!

-Matt

GB_Tools.rb

jolran

It could be the if statement your using assignment instead of comparison ?
= to ==

TIG

As has been said - your tests do not use the correct syntax.

Using if x = 6 is ALWAYS going to return true... because using that syntax you have simply set x to be 6: the = 'assigns' values.
Using if x **==** 6 will only return true if x IS 6: the == 'compares' values.

AdamB

In order to avoid using assignment rather than comparison, software devs often put the constant on the left side of the expression because it cannot be "assigned to" (properly, its not an "lvalue") so you avoid this common typo.

ie write it as:

if 6 == x

whereas (mistakenly) typing:

if 6 = x

will cause your programming language to bark at you.

matt.gordon320

Ah, I see. Fixed. I've definitely got more digging and learning to do. I don't understand the ruby syntax very well yet. Thanks guys! I'll post whenever I update more/have another question.

Dan Rathbun

Read the Pick-Axe book.

mptak

Pick Axe book...you mean the Ruby Newbie's Guide....?

Dan Rathbun

I mean:

[doc] Programming Ruby (The "Pick-Axe" Book)

matt.gordon320

Thanks Dan, coincidentally I just bought the pick axe. I'll be hammering though my way through that starting this weekend

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