json.get: Difference between revisions

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|Error example=
|example=
<source lang="mtmacro" line>
<source lang="mtmacro" line>
   [h: a = json.fromStrProp("a=1;b=44;c=12")] [r: json.get(a,"X")]
   [h: a = json.fromStrProp("a=1;b=44;c=12")] [r: json.get(a,"X")]

Revision as of 06:44, 31 December 2010

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json.get() Function

Introduced in version 1.3b49
Returns the value in a JSON Array at the specified index, returns a slice of a JSON Array from the specified indexes, or returns the value from JSON Object for the specified key.

Usage

json.get(array, index)
json.get(array, start, end)
json.get(object, key, key, ...)

Parameters

  • array - The JSON Array to retrieve the element from.
  • index - The numerical index of the element you want returned.
  • start - The starting index of the element you wish the slice to begin at.
  • end - The ending index of the element you wish the slice to end at.
  • object - The JSON Object to retrieve the element from.
  • key - The name of a field that should be returned. This parameter can exist more than once, if it does then a JSON Object is returned with all the specified elements.

Negative numbers can be used as the offsets from the end of the array, -1 is the last element in the array, -2 is the second to last, and so on. If the end index is smaller than the start index then the array slice is returned in reverse.

Example

  [h: a = json.fromStrProp("a=1;b=44;c=12")] [r: json.get(a,"X")]
  [h: a = json.fromList("1,44,12")] [r: json.get(a,9)]

Returns

 ""  (empty string)
<invalid code: java.lang.ArrayIndexOutOfBoundsException>


Version Changes