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Update painless-statements with if/else example #47485

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Oct 3, 2019
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Update painless-statements with if/else example #47485

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19 changes: 18 additions & 1 deletion docs/painless/painless-lang-spec/painless-statements.asciidoc
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Expand Up @@ -4,11 +4,28 @@
Painless supports all of Java's https://docs.oracle.com/javase/tutorial/java/nutsandbolts/flow.html[
control flow statements] except the `switch` statement.

==== Conditional statements

===== If / Else

[source,painless]
---------------------------------------------------------
if (doc[item].size() == 0) {
// do something if "item" is missing
} else {
// do something else
}
---------------------------------------------------------

==== Loop statements

===== For

Painless also supports the `for in` syntax from Groovy:

[source,painless]
---------------------------------------------------------
for (item : list) {
...
}
---------------------------------------------------------
---------------------------------------------------------