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* Improve Filter Syntax documentaion / navigation * update links and missing diagrams * rename legacy prefix to shortcut prefix * Update editions/tw5.com/tiddlers/filters/Filter Operators.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Sort Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/Cascade Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * Update editions/tw5.com/tiddlers/filters/syntax/And Filter Run Prefix.tid Co-authored-by: yaisog <m@rcuswinter.de> * add most changes a suggested by yaisog * fix copy / paste from-version * replace operand with parameter in the docs * fix typo * fix typos and improve railroad diagrams consistency * move "new from version" info for filter run prefixes below the table * fix typo transclusion and substitution * Move Filters tiddler to the top level in the TOC * wip-breadcrumbs * breadcrumbs & breadcrumbsList macro final * remove files that do not belong to this PR * restore release banner * add simple / story mode to breadcrumbs * .breadcrumbs macro update comments * new breadcrumbs CSS, woks with small screens * make CSS configurable using hidden-settings * improve CSS fro small screens * remove the initial: recursiveParentTag macro * improve location info for breadcrumbs nav. add "alt-text" for Edge ::after element * breadcrumbs add mode=field * bc add initial docs * breadcrumbsField will also respect the story ordering * add configurable global filterMode setting * improve arrow CSS for browser zooming * add bc links use bc-caption if caption field is non-empty * breadcrumbs improve comments * breadcrumbs aria-lable uses caption if there is one * breadcrumbs improve documentation * breadcrumbs improve docs for sort param * fix showArrows docs * remove .bc-link aria-label .. it's not needed if caption is resolved properly * use subfilter instead of enlist to evaluate the "excluded" variable. Be consistent with toc-macros * remove breadcrumbs macros - they have their own PR now * resolve conflict * add back doc-macros tiddler * integrate :then filter run prefix * remove .breadcrumbs macros and their config tiddlers * fix typos as requested --------- Co-authored-by: yaisog <m@rcuswinter.de>
83 lines
2.5 KiB
Plaintext
83 lines
2.5 KiB
Plaintext
created: 20220611104737314
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modified: 20220611104737314
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tags: [[Filter Operators]] [[JSON Operators]]
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title: jsontype Operator
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caption: jsontype
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op-purpose: retrieve the type of a property from JSON strings
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op-input: a selection of JSON strings
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op-parameter: one or more indexes of the property whose type is to be retrieved
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op-output: the types of each of the retrieved properties
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<<.from-version "5.2.4">> See [[JSON in TiddlyWiki]] for background.
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The <<.op jsontype>> operator is used to retrieve the type of a property in JSON data. See also the following related operators:
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* <<.olink jsonget>> to retrieve the values of a property in JSON data
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* <<.olink jsonindexes>> to retrieve the names of the fields of a JSON object, or the indexes of a JSON array
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* <<.olink jsonextract>> to retrieve a JSON value as a string of JSON
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JSON supports the following data types:
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* ''string'' - a Unicode string
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* ''number'' - a floating point number
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* ''boolean'' - Boolean value (true or false)
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* ''array'' - an array of values
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* ''object'' - an object of name/value pairs
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* ''null'' - a special type representing a missing value
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Properties within a JSON object are identified by a sequence of indexes. In the following example, the value at `[a]` is `one`, and the value at `[d][f][0]` is `five`.
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```
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{
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"a": "one",
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"b": "",
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"c": "three",
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"d": {
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"e": "four",
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"f": [
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"five",
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"six",
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true,
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false,
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null
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],
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"g": {
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"x": "max",
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"y": "may",
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"z": "maize"
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}
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}
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}
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```
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The following examples assume that this JSON data is contained in a variable called `jsondata`.
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The <<.op jsontype>> operator uses multiple parameters to specify the indexes of the property whose type is to be retrieved:
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```
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[<jsondata>jsontype[a]] --> "string"
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[<jsondata>jsontype[d]] --> "object"
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[<jsondata>jsontype[d],[f]] --> "array"
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[<jsondata>jsontype[d],[f],[2]] --> "boolean"
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```
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<<.from-version "5.3.2">> Negative indexes into an array are counted from the end, so -1 means the last item, -2 the next-to-last item, and so on:
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```
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[<jsondata>jsontype[d],[f],[-1]] --> "null"
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[<jsondata>jsontype[d],[f],[-2]] --> "boolean"
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[<jsondata>jsontype[d],[f],[-4]] --> "string"
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```
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Indexes can be dynamically composed from variables and transclusions:
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```
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[<jsondata>jsontype<variable>,{!!field},[0]]
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```
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A subtlety is that the special case of a single blank parameter is used to identify the root object. Thus:
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```
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[<jsondata>jsontype[]] --> "object"
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```
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