Редактирование: Understanding SS13 code (раздел)

=== Conditionals ===

Conditionals are statements which determine how the code will be executed, depending on a condition. The most common conditional is the IF statement

==== = vs. == ====

  var/a
  a = 14
  if (a == 14)
    world << "A has the value [a]"
  else
    world << "A is not 14"

As in the example above, the single = means you assign the value on the right to the variable on the left. In the example above, the variable a was assigned the value 14 (a = 14)

The double == is used to compare two values. It's most commonly used in the if statement. In the example above you can see we compared the variable a to 14 (a == 14). This determines how the if will react.

Comparison Operators
[http://www.byond.com/members/?command=reference&path=proc%2Fif reference]

The example shows a simple if statement. If statements work by first checking if the statement in the brackets, in the case above a == 14, is true or not. If it's true, it will proceed to execute the code, which is further indented from the if (in the case above: world << "A has the value [a]"). In the other case, if the statement is not true, it will jump to the else statement and execute the code, which is indented from that. It will only jump to the else statement if one is present. In the example, if a was not 14, it would execute world << "A is not 14"

Comparison operators include:
<br>'''==''' Is Equal To
<br>'''!=''' Is Not Equal To
<br>'''<''' Less than
<br>'''>''' More than
<br>'''<=''' Less or equal
<br>'''>=''' More or equal

==== Switch-case statement ====
[http://www.byond.com/members/?command=reference&path=proc%2Fswitch reference]