JSON Arrays
A JSON array is a comma-separated list of JSON values surrounded by square brackets.
The values in an array can have different data types.
Array values are referenced by specifying an array name followed by a list of array indexes in square brackets.
An array index is used to reference an array value/element. Rules for array indexes are as follows:
• Array indexes can be single numbers. Floats are rounded down.
• The first element of an array is at index 0.
• "last" represents the last element of the array; "last-1", "last-2" are also permitted.
• The keyword “to” is used to represent a range. If
X to Y is used where X is greater than Y, it is an error in strict mode and returns no elements in lax mode. (For more information on modes, see
Lax and Strict Modes.)
• An asterisk (*) returns all elements of the array.
• Out of range indexes are ignored in lax mode and are errors in strict mode.
• In lax mode, scalars can be treated as one-element arrays.
Examples:
Let A1 be the array [0, 1.0, 2, "three", {"number":4}, [5,6]]
• A1[0] = 0
• A1[last] = [5,6]
• A1[1 to last-2] = 1.0, 2, “three”
• A1 [*] = 0, 1.0, 2, “three”, {“Number”:4}, [5,6]
The following are errors for strict mode and return the shown result for lax mode:
• A1[2.1, 10, 0 to 1, 2] = 2, 0, 1.0, 2 (in that order)
• A1 [*].Number = 4
• A1 [*][1] = 6
• A1 [*][0] = 0, 1.0, 2, “three”, {“Number”:4}, 5
• A1 [-1 to 1] = 0, 1.0
Last modified date: 01/04/2024