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retired
A standard library for the Gleam programming language
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src/gleam/map.gleam
import gleam/result
import gleam/list
pub external type Map(key, value);
pub external fn size(Map(k, v)) -> Int
= "maps" "size"
pub external fn to_list(Map(key, value)) -> List(struct(key, value))
= "maps" "to_list"
pub external fn from_list(List(struct(key, value))) -> Map(key, value)
= "maps" "from_list"
external fn is_key(key, Map(key, v)) -> Bool
= "maps" "is_key"
pub fn has_key(map, key) {
is_key(key, map)
}
pub external fn new() -> Map(key, value)
= "maps" "new"
pub external fn get(from: Map(key, value), get: key) -> Result(value, Nil)
= "gleam_stdlib" "map_get";
external fn erl_insert(key, value, Map(key, value)) -> Map(key, value)
= "maps" "put";
pub fn insert(into map, for key, insert value) {
erl_insert(key, value, map)
}
external fn erl_map_values(fn(key, value) -> value, Map(key, value))
-> Map(key, value)
= "maps" "map";
pub fn map_values(in map, with fun) {
erl_map_values(fun, map)
}
pub external fn keys(Map(keys, v)) -> List(keys)
= "maps" "keys"
pub external fn values(Map(k, values)) -> List(values)
= "maps" "values"
external fn erl_filter(fn(key, value) -> Bool, Map(key, value))
-> Map(key, value)
= "maps" "filter";
pub fn filter(in map, for predicate) {
erl_filter(predicate, map)
}
external fn erl_take(List(k), Map(k, v)) -> Map(k, v) = "maps" "with"
pub fn take(from map, drop desired_keys) {
erl_take(desired_keys, map)
}
pub external fn merge(into: Map(k, v), merge: Map(k, v)) -> Map(k, v) = "maps" "merge"
external fn erl_delete(k, Map(k, v)) -> Map(k, v) = "maps" "remove"
pub fn delete(from map, delete key) {
erl_delete(key, map)
}
pub fn drop(from map, drop disallowed_keys) {
list.fold(disallowed_keys, map, fn(key, acc) {
delete(acc, key)
})
}
pub fn update(in map, update key, with fun) {
case get(map, key) {
Ok(value) -> insert(map, key, fun(Ok(value)))
Error(_) -> insert(map, key, fun(Error(Nil)))
}
}
fn do_fold(list, initial, fun) {
case list {
[] -> initial
[struct(k, v) | tail] -> do_fold(tail, fun(k, v, initial), fun)
}
}
pub fn fold(map, from initial, with fun) {
let kvs = to_list(map)
do_fold(kvs, initial, fun)
}