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How to Modify A Map In Elixir?

2 minutes read

To modify a map in Elixir, you can use the Map.update/3 function to update a specific key in the map with a new value. Alternatively, you can use the Map.put/3 function to add a new key-value pair to the map or update an existing key with a new value. You can also use the Map.delete/2 function to remove a key from the map. Additionally, you can pattern match on the map and destructure it to access and modify individual key-value pairs. Elixir's map syntax also allows for easy construction and modification of maps using the %{} syntax. Overall, modifying a map in Elixir is straightforward and can be done using a variety of built-in functions and syntax features.


What is the Map.to_list/1 function used for in elixir?

The Map.to_list/1 function is used in Elixir to convert a map data structure into a list of key-value pairs. This function takes a map as an argument and returns a list of tuples, where each tuple contains a key-value pair from the original map. This can be useful when you need to work with a map as a list of pairs, for example when iterating through the map or performing operations on the key-value pairs.


What is the Map.delete/2 function used for in elixir?

The Map.delete/2 function in Elixir is used to remove a specific key and its associated value from a map. It takes two arguments: the map from which to delete the key-value pair, and the key that you want to delete. Example:

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map = %{a: 1, b: 2, c: 3}
new_map = Map.delete(map, :b)
# new_map is now %{a: 1, c: 3}



What is the Map.to_struct/1 function used for in elixir?

The Map.to_struct/1 function in Elixir is used to convert a map into a struct. Structs in Elixir are data structures that provide a way to enforce a specific shape on a map. By using Map.to_struct/1, you can define a struct and then convert a map into that struct, ensuring that the map has the same keys and values as the struct's fields. This can be useful for working with structured data in a more type-safe and organized way.


How to delete a key from a map in elixir?

In Elixir, you can delete a key from a map by using the Map.delete/2 function. This function takes two arguments - the map you want to delete the key from, and the key you want to delete.


Here's an example of how you can delete a key from a map in Elixir:

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map = %{a: 1, b: 2, c: 3}
key_to_delete = :b

new_map = Map.delete(map, key_to_delete)

IO.inspect(new_map) # Output: %{a: 1, c: 3}


In this example, we have a map map with three key-value pairs. We want to delete the key :b from the map, so we use Map.delete(map, key_to_delete) to create a new map new_map without the key :b.

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