Core

Utilities for working with objects and arrays.

KEYS(coll)

• Parameters: coll – list or object
• Returns: list of keys or indices
• Example: KEYS({"a":1}) → ["a"]

VALUES(obj)

• Parameters: obj – object
• Returns: list of values
• Example: VALUES({"a":1}) → [1]

ENTRIES(obj)

• Parameters: obj – object
• Returns: list of { "key": k, "value": v }
• Example: ENTRIES({"a":1}) → [{"key":"a","value":1}]

PUT(coll, key, value)

• Parameters: coll – object or list, key – index or key, value – value to set
• Returns: new collection with the value added or replaced
• Example: PUT([1,2], 2, 9) → [1,2,9]

DELETE(coll, key)

• Parameters: coll – object or list, key – index or key to remove
• Returns: collection without the given entry
• Example: DELETE({"a":1}, "a") → {}

WALK(tree)

• Parameters: tree – nested object or list
• Returns: sequence of entries describing each node
• Example: COLLECT(WALK({"a":1})) → [{"path":["a"],"key":"a","value":1,"depth":1,"isLeaf":true}]

APPEND(list, value)

• Parameters: list – list, value – value to append
• Returns: new list with value added to end
• Example: APPEND([1],2) → [1,2]

PREPEND(list, value)

• Parameters: list – list, value – value to prepend
• Returns: new list with value added to start
• Example: PREPEND([1],2) → [2,1]

COLLECT(iterable)

• Parameters: iterable – iterable or sequence
• Returns: list containing all elements
• Example: COLLECT(WALK([1])) → [{"path":[0],"key":0,"value":1,"depth":1,"isLeaf":true}]

PRINT(...args)

• Parameters: any number of values
• Returns: null
• Example: PRINT("hi") outputs hi

IS_OBJECT(x)

• Parameters: x – value to test
• Returns: true if x is an object, else false
• Example: IS_OBJECT({}) → true