else

Purpose

Conditionally execute statements.

if expression
    statements
else
    statements
end

else is used to delineate an alternate block of statements.

if expression
    statements
else
    statements
end

The second set of statements is executed if the expression has any zero elements. The expression is usually the result of

expression rop expression

where rop is ==, <, >, <=, >=, or ~=.

elseif, if