Booleans

is-boolean

Description

Examples

Arguments:
VALUES(value-expression{1})

Boolean function that returns true if value is a boolean literal or if it is a list, that the first element in the list is a boolean

["is-boolean", false]

Returns true.

["is-boolean", "True"]

Returns false.

["is-boolean", ["list", true, "12345"]]

Returns true.

["is-boolean", ["list", "12345", true]]

Returns false.

["is-boolean", ["list", ["boolean", "FALSE"], 1234]]

Returns true.

boolean

Description

Examples

Arguments:
FUNCTION(default-value-expression(0|1}
VALUES(value-expression{1})

Translates all non-null input values to booleans. If no default value expression is given, values that don’t parse as boolean values will be silently ignored. If not, the evaluated value from the default expression will be used as a replacement value. String literals are case insensitive, and the supported values are “true” and “false”.

["boolean", "false"]

Returns one boolean: false.

["boolean", null]

Returns null.

["boolean",
["list", "true", "~rhttp://www.example.org/",
"True", false, 1234]]

Returns a list of booleans: [true, true, false]. The URI and integer values are ignored.

["boolean", ["boolean", false],
["list", "true", "~rhttp://www.example.org/",
"124.4", "FALSE"]]

Returns a list of booleans: [true, false, false, false]. The URI value and the string value are replaced with the literal value: false

["boolean", ["string", "n/a"],
["list", "true", "~rhttp://www.example.org/", "124.4"]]

Returns a list of booleans: [true, “n/a”, “n/a”]. The URI value and the string value are replaced with the literal value “n/a”

["boolean", ["string", "_."],
["list", "true", "~rhttp://www.example.org/", "False"]]

Returns a list of booleans: [true, “http://www.example.org/”, false]. The URI value is replaced with its string cast.