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map_sorter
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0.1.0
Sorts a list of maps per a list of sort specs.
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map_sorter
README.md
README.md
# Map Sorter
**Generates the AST to sort maps per sort specs (ascending/descending keys).**
## Installation
The package can be installed by adding `:map_sorter` to your list of
dependencies in `mix.exs`:
```elixir
def deps do
[
{:map_sorter, "~> 0.1.0"}
]
end
```
## Usage
```elixir
require MapSorter
MapSorter.sort(maps, sort_specs)
```
Takes a list of `maps` and either a list of `sort specs` or an AST
that will evaluate to a list of `sort specs` at runtime.
Returns the AST to sort the `maps` per the `sort specs`.
`sort specs` can be implicit, explicit or mixed:
- [:dob, :name] is implicit ⇒ [asc: :dob, asc: :name]
- [:dob, desc: :name] is mixed ⇒ [asc: :dob, desc: :name]
- [asc: :dob, desc: :name] is explicit
## Examples
```elixir
require MapSorter
people = [
%{name: "Mike", likes: "ski, arts", dob: "1992-04-15"},
%{name: "Mary", likes: "travels" , dob: "1992-04-15"},
%{name: "Ann" , likes: "reading" , dob: "1992-04-15"},
%{name: "Ray" , likes: "cycling" , dob: "1977-08-28"},
%{name: "Bill", likes: "karate" , dob: "1977-08-28"},
%{name: "Joe" , likes: "boxing" , dob: "1977-08-28"},
%{name: "Jill", likes: "cooking" , dob: "1976-09-28"}
]
MapSorter.sort(people, asc: :dob, desc: :likes)
```
The above code will sort `people` ascendingly by `:dob` and
descendingly by `:likes` as follows:
```elixir
[
%{name: "Jill", likes: "cooking" , dob: "1976-09-28"},
%{name: "Bill", likes: "karate" , dob: "1977-08-28"},
%{name: "Ray" , likes: "cycling" , dob: "1977-08-28"},
%{name: "Joe" , likes: "boxing" , dob: "1977-08-28"},
%{name: "Mary", likes: "travels" , dob: "1992-04-15"},
%{name: "Mike", likes: "ski, arts", dob: "1992-04-15"},
%{name: "Ann" , likes: "reading" , dob: "1992-04-15"}
]
```