52 lines
1.8 KiB
Plaintext
52 lines
1.8 KiB
Plaintext
created: 20200412181551706
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modified: 20200412181551706
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tags: [[Filter Operators]] [[Mathematics Operators]] [[String Operators]] [[Negatable Operators]]
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title: compare Operator
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type: text/vnd.tiddlywiki
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caption: compare
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op-purpose: filter the input by comparing each item against the parameter
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op-input: a [[selection of titles|Title Selection]]
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op-suffix: the <<.op compare>> operator uses a rich suffix, see below for details
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op-parameter: the value to compare
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op-output: those input titles matching the specified comparison
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op-neg-output: those input titles <<.em not>> matching the specified comparison
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<<.from-version "5.1.22">>The <<.op compare>> filter allows numerical, string and date comparisons to be performed.
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The <<.op compare>> operator uses an extended syntax to specify all the options:
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```
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[compare:<type>:<mode>[<parameter>]]
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```
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The ''type'' can be:
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* "number" - invalid numbers are interpreted as zero
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* "integer" - invalid integers are interpreted as zero
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* "string"
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* "date" - invalid dates are interpreted as 1st January 1970
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* "version" - invalid versions are interpreted as "v0.0.0"
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The ''mode'' can be:
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* "eq" - equal to
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* "ne" - not equal to
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* "gteq" - greater than or equal to
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* "gt" - greater than
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* "lteq" - less than or equal to
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* "lt" - less than
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The operator compares each item in the selection against the value of the parameter, retaining only those items that pass the specified condition.
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For example:
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```
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[[2]compare:number:eq[3]] returns nothing
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[[2]compare:number:lt[3]] returns "2"
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[[2]compare:number:eq[2]] returns "2"
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```
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Note that several of the variants of the <<.op compare>> operator are synonyms for existing operators, and are provided in the interests of consistency. For example, `compare:string:eq[x]` is a synonym for `match[x]`.
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<<.operator-examples "compare">>
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