[AMG]: ?: is the ternary operator, so called because it takes three arguments.

===
''condition'' '''?''' ''true_value'' ''':''' ''false_value''
===

It evaluates to ''true_value'' if ''condition'' is true.  Otherwise, it evaluates to ''false_value''.

See [expr].

Unlike most [expr] operations, this one does not have a command counterpart in the [tcl::mathop] namespace -- mostly because [if] command already provides the would-be functionality ([if] returns the value returned by the branch it evaluates).

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