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If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
Unless each then-clause and else-clause is carefully tested, to watch for extra newlines, then the results are likely to cause broken lines, with extra line breaks for each newline. For that reason, a global edit with simple search-and-replace of " {#if: " to " {if|| " is likely to leave newline problems, wherever the original markup was ...
Undefined parameter values are tricky: if the first positional parameter was not defined in the template call, then {{{1}}} will evaluate to the literal string "{{{1}}}" (i.e., the 7-character string containing three sets of curly braces around the number 1), which is a true value.
A major advantage of using this template over using the construct {{#if:{{{1|}}}{{{2|}}} |…}} is that if the first parameter is not empty then the second parameter is not evaluated. The "or" in the " a or b " above is inclusive : if both a and b are true, the template will return the first result .
It can help editors create template code that is self documenting. Usage. If a and b then true. If a nor b then false. If either a or b then false.
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[[Category:If-then-else templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:If-then-else templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.