> For the complete documentation index, see [llms.txt](https://max-daunarovich.gitbook.io/flow-network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://max-daunarovich.gitbook.io/flow-network/introduction/values-and-types/dictionaries.md).

# Dictionaries

Dictionaries are mutable, unordered collections of key-value associations. In a dictionary, all keys must have the same type, and all values must have the same type. Dictionaries may contain a key only once and may contain a value multiple times.

Dictionary literals start with an opening brace `{` and end with a closing brace `}`. Keys are separated from values by a colon, and key-value associations are separated by commas.

```
// An empty dictionary
//
{}

// A dictionary which associates integers with booleans
//
{
    1: true,
    2: false
}

// Invalid: mixed types
//
{
    1: true,
    false: 2
}
```