Argument types¶

In the function tables below you’ll see argument lists like this CONDITION(boolean-expression{1}), THEN(transforms{1}), ELSE(transforms{0|1}).

CONDITION, THEN and ELSE are logical names that have no meaning other than so that we can refer to them by name. Inside the parenthesis is the type of argument, i.e. boolean-expression and transforms. The numbers inside the curly braces is the cardinality of the argument. Here are some cardinalites that you’ll come across:

{0|1}: zero or one, i.e. optional.
{1}: exactly one
{2}: exactly two
{>=0}: zero or more
{>=1}: one or more

Argument type	Description	Examples
`boolean-expression`	Refers to an expression that returns a single “boolean” value. Note that `false`, `null` and `[]` evaluate to false. All other values evaluate to true.	`["eq", "_S.type", "person"]`
`integer-expression`	Refers to an expression that returns a single “integer” value.	`["+", 1, 2]`
`value-expression`	Refers to an expression that returns null, a single value or a list of values.	`["list", 1, 2, 3]`
`function-expression`	Refers to a value expression argument that operates on a list of values, and exposes the `_` current value variable for each of them.	`["upper", "_.name"]`
`string`	Refers to a constant string literal.	`"Jupiter"`
`wildcard-string`	Refers to a constant string pattern literal that can include the `*` and `?` wildcard characters.	`"alpha_*"` or `"person"`
`wildcard-string-list`	Same as `wildcard-string`, but a list of them.	`["alpha_", "beta_"]`
`transforms`	A single transform function, or a list of them.	`["add", "type", "person"]` or `[["add", "type", "person"],` `["copy", ["list", "name", "age"]]]]`

UUIDs

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