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How to Delete "Any" Element Of A List In Elixir?

3 minutes read

In Elixir, you can delete any element of a list by using the Enum.delete_at/2 function. This function takes two arguments: the list from which you want to delete the element and the index of the element you want to delete. It returns a new list with the specified element removed. Remember that in Elixir, lists are immutable, so the original list will remain unchanged.


How to remove the last n elements from a list in Elixir?

You can remove the last n elements from a list in Elixir using the Enum.take function in combination with the Enum.count function. Here's an example:

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list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
n = 3

new_list = list |> Enum.take(Enum.count(list) - n)
IO.inspect(new_list) # Output: [1, 2, 3, 4, 5, 6]


In the example above, we first calculate the number of elements to keep by subtracting the value of n from the total count of elements in the list using Enum.count. We then use Enum.take to create a new list that contains only the elements up to the calculated index.


How to remove all elements that satisfy a certain condition from a list in Elixir?

You can use the Enum.reject/2 function in Elixir to remove all elements that satisfy a certain condition from a list. Here's an example:

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list = [1, 2, 3, 4, 5]

new_list = Enum.reject(list, fn x -> x > 3 end)

IO.inspect(new_list)  # Output: [1, 2, 3]


In this example, we use the Enum.reject/2 function to remove all elements from the list list that are greater than 3. The anonymous function fn x -> x > 3 end defines the condition that should be satisfied in order for an element to be removed. The resulting list new_list will contain only the elements that do not satisfy the condition.


How to delete elements from a list using list comprehension in Elixir?

In Elixir, you can use list comprehension to delete elements from a list based on a certain condition. Here's an example of how you can delete elements from a list using list comprehension:

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list = [1, 2, 3, 4, 5]
element_to_delete = 3

new_list = for x <- list, x != element_to_delete, do: x

IO.inspect(new_list)


In this example, we have a list [1, 2, 3, 4, 5] and we want to delete the element 3 from the list. We use list comprehension and the condition x != element_to_delete to create a new list without the element 3. Finally, we output the new list using IO.inspect.


This will give you the output: [1, 2, 4, 5], which is the original list with the element 3 deleted.


How to delete elements from a list without using the delete function in Elixir?

You can delete elements from a list in Elixir without using the delete function by writing a custom function that filters out the elements you want to delete. Here's an example implementation:

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defmodule ListHelper do
  def delete_elements(list, elements_to_delete) do
    Enum.filter(list, fn x -> not elem(x, elements_to_delete) end)
  end
end

# Usage
list = [1, 2, 3, 4, 5]
elements_to_delete = [2, 4]

result = ListHelper.delete_elements(list, elements_to_delete)
IO.inspect(result) # Output: [1, 3, 5]


In this example, the delete_elements function takes a list and a list of elements to delete as arguments. It uses the Enum.filter function to iterate over the input list and filter out the elements that are in the elements_to_delete list. The resulting list is returned without the deleted elements.

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