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+====== when(condition, expression) ======
+Returns the result of //expression// if //condition// is true. Otherwise returns [[syntax:types|empty value]]. This function is effectively a shorthand for '' if(condition, expression, empty()) ''
+^  Example  ^  Result  ^
+| when( 2 + 2 = 4, 'Makes sense')  | Makes sense  |
+| when( 1 + 1 = 4, 'Makes sense')  |   |