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https://github.com/williamthome/maps_in
An Erlang library to handle nested maps.
https://github.com/williamthome/maps_in
erlang erlang-library rebar3
Last synced: about 1 month ago
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An Erlang library to handle nested maps.
- Host: GitHub
- URL: https://github.com/williamthome/maps_in
- Owner: williamthome
- License: apache-2.0
- Created: 2022-11-05T18:17:31.000Z (about 2 years ago)
- Default Branch: main
- Last Pushed: 2022-11-06T04:33:04.000Z (about 2 years ago)
- Last Synced: 2024-10-01T15:07:44.207Z (about 1 month ago)
- Topics: erlang, erlang-library, rebar3
- Language: Erlang
- Homepage: https://hex.pm/packages/maps_in
- Size: 452 KB
- Stars: 5
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# maps_in
An Erlang library to handle nested maps.
## Table of contents
- [General info](#general-info)
- [Usage](#usage)
- [filter/3](#filter3)
- [filtermap/3](#filtermap3-otp-240)
- [find/3](#find3)
- [fold/4](#fold4)
- [foreach/3](#foreach3)
- [get/2](#get2)
- [get/3](#get3)
- [keys/2](#keys2)
- [is_key/3](#is_key3)
- [iterator/2](#iterator2-otp-21)
- [map/3](#map3)
- [merge/3](#merge3)
- [merge_with/4](#merge_with4-otp-240)
- [put/3](#put3)
- [remove/3](#remove3)
- [size/2](#size2)
- [take/3](#take3)
- [to_list/2](#to_list2)
- [update/3](#update3)
- [update_with/3](#update_with3)
- [update_with/4](#update_with4)
- [values/2](#values2)
- [with/3](#with3)
- [without/3](#without3)
- [Build](#build)
- [Test](#test)
## General info
Erlang does not provide functions to handle nested maps, so this lib has this purpose and always uses a list of keys to manipulate maps.
## Usage
### filter/3
```erlang
1> Map = #{erlang => #{example => #{a => 2, b => 3, c => 4, "a" => 1, "b" => 2, "c" => 4}}}.
#{erlang =>
#{example =>
#{a => 2,b => 3,c => 4,"a" => 1,"b" => 2,"c" => 4}}}
2> Pred = fun(K, V) -> is_atom(K) andalso (V rem 2) =:= 0 end.
#Fun
3> maps_in:filter([erlang, example], Pred, Map).
#{erlang => #{example => #{a => 2,c => 4}}}
```
### filtermap/3 (OTP 24.0)
```erlang
```
### find/3
```erlang
```
### fold/4
```erlang
```
### foreach/3
```erlang
```
### get/2
```erlang
1> Map = #{my => #{nested => map}}.
#{my => #{nested => map}}
2> maps_in:get([my, nested], Map).
map
```
### get/3
```erlang
1> Map = #{my => #{nested => map}}.
#{my => #{nested => map}}
2> maps_in:get([my, unknown_key], Map, default).
default
```
### keys/2
```erlang
```
### is_key/3
```erlang
```
### iterator/2 (OTP 21)
```erlang
```
### map/3
```erlang
```
### merge/3
```erlang
```
### merge_with/4 (OTP 24.0)
```erlang
```
### put/3
```erlang
1> Map = #{my => #{more => #{deep => #{}}}}.
#{my => #{more => #{deep => #{}}}}
2> maps_in:put([my, more, deep], #{nested => map}, Map).
#{my => #{more => #{deep => #{nested => map}}}}
```
### remove/3
```erlang
```
### size/2
```erlang
```
### take/3
```erlang
```
### to_list/2
```erlang
```
### update/3
```erlang
1> Map = #{my => #{more => #{deep => #{}}}}.
#{my => #{more => #{deep => #{}}}}
2> maps_in:update([my, unknown_key], error, Map).
** exception error: bad key: unknown_key
3> maps_in:update([my, more, deep], #{nested => map}, Map).
#{my => #{more => #{deep => #{nested => map}}}}
```
### update_with/3
```erlang
1> Map = #{someone => #{age => 17}}.
#{someone => #{age => 17}}
2> maps_in:update_with([someone, age], fun(Age) -> Age + 1 end, Map).
#{someone => #{age => 18}}
```
### update_with/4
```erlang
```
### values/2
```erlang
```
### with/3
```erlang
```
### without/3
```erlang
```
## Build
$ rebar3 compile
## Test
$ rebar3 eunit