try-catch

The try-catch expression allows you to handle errors gracefully by providing a fallback value when an expression fails.

Syntax

try <expr> catch <expr>

Behavior

• If the try expression succeeds, its result is returned
• If the try expression fails (produces an error), the catch expression is evaluated instead
• The catch expression receives the same input as the try expression

Examples

Basic Error Handling

# When the expression succeeds
try: "value" catch: "unknown"

# When the expression fails
try: get("missing") catch: "default"

Chaining with Pipe

# Try to parse as JSON, fallback to raw string
try: from_json() catch: self

# Complex fallback logic
try: do get("data") | from_json(); catch: []

Nested Try-Catch

# Multiple fallback levels
try: get("primary") catch: try: get("secondary") catch: "default"

Error Suppression (?)

The error suppression operator ? provides a concise way to handle errors by returning None when an expression fails, instead of raising an error. This is equivalent to using a regular try-catch with a default fallback.

Examples

# Equivalent to a regular try-catch with a default value
get("missing")?

In this example, if get("missing") fails, the result will be None rather than an error.