TryCatch/doc

This metatemplate simplifies implementing fallback output if an error occurs due to incorrect input. It returns the first parameter if it does not contain an error (using the #iferror parser function), and the second parameter (or the empty string) otherwise.

• {{TryCatch|{{#expr: 1/2}}|Incorrect input}} → 0.5
• {{TryCatch|{{#expr: 1/0}}|Incorrect input}} → Incorrect input

• {{Error}}: template to signal an error
• Help:Extension:ParserFunctions