created: 20140410103123179
modified: 20221229094244039
tags: [[Filter Operators]]
title: indexes Operator
type: text/vnd.tiddlywiki
caption: indexes
op-purpose: select all data properties of the input titles
op-input: a [[selection of titles|Title Selection]]
op-parameter: none
op-output: all the property names or indices contained in the input data tiddlers

Each input title is processed in turn, and is ignored if it does not denote a [[data tiddler|DataTiddlers]]. The sorted list of property names is retrieved from the data tiddler and then [[dominantly appended|Dominant Append]] to the operator's output.

Note that behind the scenes, the name/value pairs in a dictionary tiddler are represented as a [[JSON object|JSONTiddlers]]. JSON objects do not maintain a guaranteed ordering and so we cannot reliably retain the ordering of the data in the file.

Where the content of a tiddler is in JSON format with an array as its root, the <<.op indexes>> operator retrieves a selection of integer indices instead.

<<.operator-examples "indexes">>