Built-ins for hashes - FreeMarker Manual

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# Built-ins for hashes

## keys

A sequence that contains all the lookup keys in the hash. Note that not all hashes support this (ask the programmer if a certain hash allows this or not).

    <#assign h = {"name":"mouse", "price":50}>
    <#assign keys = h?keys>
    <#list keys as key>${key} = ${h[key]}; </#list>

Output:

    name = mouse; price = 50;

Since hashes do not define an order for their sub variables in general, the order in which key names are returned can be arbitrary. However, some hashes maintain a meaningful order (ask the programmer if a certain hash does that or not). For example, hashes created with the above `{...}` syntax preserve the same order as you have specified the sub variables.

## values

A sequence that contains all the variables in the hash. Note that not all hashes support this (ask the programmer if a certain hash allows this or not).

As of the order in which the values are returned, the same applies as with the `keys` built-in; see there.

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