# LayerDicts.jl

**Repository Path**: Julialang/LayerDicts.jl

## Basic Information

- **Project Name**: LayerDicts.jl
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2018-03-12
- **Last Updated**: 2022-03-03

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# LayerDicts

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`LayerDict` is an `Associative` type that wraps a series of other associatives (e.g. `Dict`s).
When performing a lookup, a `LayerDict` will look through its associatives in the order they were passed to the constructor until it finds a match.
`LayerDict`s are immutable—you cannot call `setindex!` on them.
However, you can update its wrapped associatives and those changes will be reflected in future lookups.

## Example

```julia
using LayerDicts

dict1 = Dict{Symbol, Int}(:foo => 1, :bar => 1)
dict2 = Dict{Symbol, Int}()
dict3 = Dict{Symbol, Int}(:bar => 3, :baz => 3)

ld = LayerDict([dict1, dict2, dict3])
@assert ld[:foo] == 1
@assert ld[:bar] == 1
@assert ld[:baz] == 3
ld[:quuz]  # throws a KeyError
```