JSON Array: Difference between revisions
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The JSON Array is a native JSON Data Type and supported by many MapTool macro functions as an input or output. | |||
An array is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma).< | |||
[http://www.json.org JSON.org] defines it like this: | |||
<blockquote>An array is an '''ordered''' collection of values. An array begins with {{code|[}} (left bracket) and ends with {{code|]}} (right bracket). Values are separated by a {{code|,}} (comma).</blockquote> | |||
An array may hold any of the supported JSON Data Types: Number, String, Object, Array, Boolean and Null. | |||
== Examples of JSON Arrays == | |||
An array of strings. Note that each name is quoted and the whole array has single quotes around it. | |||
<syntaxhighlight lang="mtmacro"> | |||
[h: beatles = '["Paul", "John", "George", "Ringo"]'] | |||
</syntaxhighlight> | |||
An array of prime numbers. The numbers should not be quoted but the whole array has quotes around it. | |||
<syntaxhighlight lang="mtmacro"> | |||
[h: primes = "[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31]"] | |||
</syntaxhighlight> | |||
A better way to initialize an array as you'll be less likely to have issues with quoting. | |||
<syntaxhighlight lang="mtmacro"> | |||
[h: list = json.append("[]", "Peter", "Paul", "Mary")] | |||
</syntaxhighlight> | |||
Access the elements of a JSON array with {{func|json.get}} or other JSON Functions. | |||
<syntaxhighlight lang="mtmacro"> | |||
[h: list = json.append("[]", "Peter", "Paul", "Mary")] | |||
[r: json.get(list,2)] | |||
</syntaxhighlight> | |||
Returns: Mary | |||
[[Category:Variable Type]] | [[Category:Variable Type]] | ||
Latest revision as of 23:59, 15 March 2023
The JSON Array is a native JSON Data Type and supported by many MapTool macro functions as an input or output.
JSON.org defines it like this:
An array is an ordered collection of values. An array begins with
[(left bracket) and ends with](right bracket). Values are separated by a,(comma).
An array may hold any of the supported JSON Data Types: Number, String, Object, Array, Boolean and Null.
Examples of JSON Arrays
An array of strings. Note that each name is quoted and the whole array has single quotes around it.
[h: beatles = '["Paul", "John", "George", "Ringo"]']An array of prime numbers. The numbers should not be quoted but the whole array has quotes around it.
[h: primes = "[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31]"]A better way to initialize an array as you'll be less likely to have issues with quoting.
[h: list = json.append("[]", "Peter", "Paul", "Mary")]Access the elements of a JSON array with json.get() or other JSON Functions.
[h: list = json.append("[]", "Peter", "Paul", "Mary")]
[r: json.get(list,2)]Returns: Mary