Transforms

A transform is a named operation applied to a task’s input or output — trimming text, extracting a field, encoding a value, joining a list. Transforms are reusable: the same one works wherever a value needs reshaping.

The expression form

A transform is written compactly:

type(argnum flags):options

• type names the transform: trim, keypath, prefix, …
• argnum is how many arguments it consumes; * means all of them.
• flags are optional letters, such as S to spread a list result into separate arguments.
• options is the transform’s own configuration. ,, separates several options.

Some examples:

Expression	What it does
trim:	Removes leading and trailing whitespace.
prefix:/path/to/	Prepends a path.
keypath:a.b	Extracts the nested field a.b.

Pipelines

Several transforms chain into a pipeline by writing them as a list. Each one receives what the previous one produced, so a value can be extracted, cleaned and encoded in one step.

Finding the right transform

Every transform is listed in the transform reference, with its arguments, flags and worked examples. The reference is generated from the same catalog the editor uses, so the examples there are the examples the editor applies.