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* delete asciidoc files
* add migrated files
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* Disable docs tests
* Clarify release notes page titles
* Revert "Clarify release notes page titles"
This reverts commit 8be688648d.
* Comment out edternal URI images
* Clean up query languages landing pages, link to conceptual docs
* Add .md to url
* Fixes inference processor nesting.
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Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
19 lines
1.1 KiB
Markdown
19 lines
1.1 KiB
Markdown
---
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-functions.html
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---
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# Functions [painless-functions]
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A function is a named piece of code comprised of one-to-many statements to perform a specific task. A function is called multiple times in a single script to repeat its specific task. A parameter is a named type value available as a [variable](/reference/scripting-languages/painless/painless-variables.md) within the statement(s) of a function. A function specifies zero-to-many parameters, and when a function is called a value is specified per parameter. An argument is a value passed into a function at the point of call. A function specifies a return type value, though if the type is [void](/reference/scripting-languages/painless/painless-types.md#void-type) then no value is returned. Any non-void type return value is available for use within an [operation](/reference/scripting-languages/painless/painless-operators.md) or is discarded otherwise.
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You can declare functions at the beginning of a Painless script, for example:
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```painless
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boolean isNegative(def x) { x < 0 }
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...
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if (isNegative(someVar)) {
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...
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}
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```
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