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Boolean values: Difference between revisions
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=={{header|Metafont}}==
Metafont has the type <tt>boolean</tt>; a boolean variable can be <tt>true</tt> or <tt>false</tt>. Using non boolean values (or expressions that do not evaluate to a boolean value) results in a recoverable error; by default, any non-boolean value is interpreted as false.
=={{header|Mirah}}==
<lang mirah>import java.util.ArrayList
import java.util.HashMap
# booleans
puts 'true is true' if true
puts 'false is false' if (!false)
# lists treated as booleans
x = ArrayList.new
puts "empty array is true" if x
x.add("an element")
puts "full array is true" if x
puts "isEmpty() is false" if !x.isEmpty()
# maps treated as booleans
map = HashMap.new
puts "empty map is true" if map
map.put('a', '1')
puts "full map is true" if map
puts "size() is 0 is false" if !(map.size() == 0)
# these things do not compile
# value = nil # ==> cannot assign nil to Boolean value
# puts 'nil is false' if false == nil # ==> cannot compare boolean to nil
# puts '0 is false' if (0 == false) # ==> cannot compare int to false
#puts 'TRUE is true' if TRUE # ==> TRUE does not exist
#puts 'FALSE is false' if !FALSE # ==> FALSE does not exist
</lang>
=={{header|Modula-2}}==
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