Boolean values: Difference between revisions
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This class has two methods: the operator ''!'' which returns the logical complement of its receiver and ''toString'' which returns its string representation.
<syntaxhighlight lang="
System.printAll([embed, ", ", !embed, ", ", "Is Wren embeddable? " + embed.toString])</syntaxhighlight>
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true, false, Is Wren embeddable? true
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=={{header|XLISP}}==
Boolean "false" may be represented by <tt>#F</tt>, <tt>#!FALSE</tt>, <tt>NIL</tt>, or the empty list; any other value is counted as true in conditional expressions, but it is also possible to represent the Boolean value "true" using your choice of the symbols <tt>#T</tt>, <tt>#!TRUE</tt>, and <tt>T</tt>. All these symbols are case-insensitive. Note that <tt>T</tt>, unlike the others, is a variable: it is bound by default to the constant <tt>#T</tt>, but you can (although you shouldn't) assign it any other value including "false" (by doing something like <tt>(setq t nil)</tt>). Boolean values are printed as <tt>#T</tt> and <tt>()</tt>.
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