RGSS scripting dissections and explinations

[kyonides]

Staying away from integers is impossible! Even your bills have them! Even defining where a new window or sprite should be located on screen needs them! Labels displayed on screen like how much gold your heroes carry along need them! The catch would be that most of the time you'd only need to handle Integers (1, -2, 1000000 and such) and kind of rarely some floats like 1.2349 or Math::PI if you need to calculate angles and x and y coordinates with some help of Math.sin(x) and Math.cos(y) or angles and distances with Math.atan(dx,dy) and some details I skipped here on purpose because I know they're too complex for you XD

Don't tell me you didn't get the idea after reading my previous post about three times... -_-'

Expression Substitutions...

If you know what a substitution means then it won't take long for you to understand why they do exist.

@substituted_player = Player.new
@substituted_player.name = "Stan"
print "#{@substituted_player.name}, the kind of old hockey player, steps out right now and gets a seat in no time." # => "Stan, the kind of old hockey player, steps out right now and gets a seat in no time."

@substitute_player = Player.new
@substitute_player.name = "Ralph"
print "#{@substitute_player.name}, the hockey newbie, steps in." # => "Ralph, the hockey newbie, steps in."

I hope these two hockey related examples tells you something about what they actually do and how they work. Just in case I'll let you read what would have happened if we didn't "substituted" the @instance variable with its method name like I showed you above. (We're gonna make a mistake on purpose.)

print @substituted_player.name ", the kind of old hockey player, steps out right now and gets a seat in no time."
ArgumentError: wrong number of arguments (given 1, expected 0)
from (irb):3:in `name'
from (irb):3
from /usr/bin/irb:1:in `<main>'

Argument = Parameter = value you pass to Ruby via any specific method, here it's print.

On RMXP you've watched a pop up window furiously appear on sight to tell you something like the error message posted above and your game project would be shutdown immediately afterwards.