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DOCS: Update documentation for the select expression.

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Talk about the default being optional and what will happen
the field doesn't exist and no default is specified.
This commit is contained in:
Jeremy Wall 2019-03-01 17:15:07 -06:00
parent 40107cefb6
commit ecde7f4636
1 changed files with 6 additions and 5 deletions
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11
docsite/site/content/reference/expressions.md
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@ -507,10 +507,11 @@ Conditionals
UCG supports a limited conditional expression called a select. A select
expression starts with the `select` keyword and is followed by a an expression
resolving to a string or boolean naming the field to select, an expression
resolving to the default value, and finally a tuple literal to select the field
from. If the field selected is not in the tuple then the default value will be
used.
resolving to a string or boolean naming the field to select, an optional
expression resolving to the default value, and finally a tuple literal to
select the field from. If the field selected is not in the tuple then the
default value will be used. If no default is specified then select will
throw a compile failure for the unhandled case.
```
let want = "baz";
@ -527,7 +528,7 @@ select "quack", "quux", {
fuzz = "bang",
}; // result will be "quux"
let ifresult = select true, NULL, {
let ifresult = select true, {
true = "true result",
false = "false result",
}; // result will be "true result"