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website: Document the index and attribute syntaxes

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Martin Atkins 2018-05-13 14:22:30 -07:00
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website/docs/configuration/expressions.html.md
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@ -247,6 +247,20 @@ effect:
Unknown values appear in the `terraform plan` output as `(not yet known)`.
## Indices and Attributes
Elements of list-, tuple-, map-, and object-typed values can be accessed using
the square-bracket index notation, like `local.list[3]`. The expression within
the brackets must be a whole number for list and tuple values or a string
for map and object values.
Object attributes with names that are valid identifiers can also be accessed
using the dot-separated attribute notation, like `local.object.attrname`. This
syntax is also allowed for accessing map elements with keys that are valid
identifiers, but we recommend using the square-bracket index notation
(`local.map["keyname"]`) when a map contains arbitrary user-specified keys, as
opposed to an object with a fixed set of attributes defined by a schema.
## Arithmetic and Logical Operators
An _operator_ is a type of expression that transforms or combines one or more