[Proposal] List.delete support for delete multiple fields inside a list

[Randson]

Currently, the function `List.delete` only works for a single field. What I want to add is the possibility to delete multiple fields by passing a list of fields I want to remove.

Can be like this one:

```elixir

List.delete([:a, :b, :c, :d, :e], [:a, :b])

#=> [:c, :d, :e]

```

Or, it can be a new function to totally deal with that. like:

```elixir

List.delete_many([:a, :b, :c, :d, :e], [:a, :b])

#=> [:c, :d, :e]

```

What do you guys think about that?

Cheers,

Randson

[Andrey Yugai]

Hey Randson, have you seen `Enum.filter`? It does almost exactly what you want, except for any enumerable, not just list.

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[Randson Oliveira]

Nice, thanks for the heads up.

 

Yep, it works exactly the way I want. However, it would be nice to have that pattern matching option. Without having to call the Enum module.

 

But yeah, if you guys think just using `Enum.filter` is enough. I’m okay.

 

Thanks,

Randson

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[Andrey Yugai]

From the top of the head I can think of `Enum/Stream.chunk_every(list, n, 1) |> Enum.filter(...)` to delete matching sequences of length n. Perhaps there's better data structure choice in your particular case.

-------- Original Message --------

On 7 Jun 2022, 18:41, Randson Oliveira < oran...@gmail.com> wrote:

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[Zach Daniel]

You wouldn't be able to pattern match on the input being a list regardless because you could have a list of lists and be wanting to delete one of those lists.

For example:

```elixir

List.delete([[:a, :b], [:c, :d]], [:a, :b])

#=> [[:c, :d]]

```

And I generally agree with others that the Enum module is sufficient for this, i.e `Enum.reject([:a, :b, :c, :d, :e], &(&1 in [:a, :b]))` reads pretty clear to me.

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[Wojtek Mach]

The  --/2 operator already does this. :)

iex(1)> [:a, :b, :c, :d, :e] -- [:a, :b]

[:c, :d, :e]

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[Zach Daniel]

The `--` operator has an important difference in behavior from Enum.filter/reject, though.

[:a, :a, :a] -- [:a]
[:a, :a]

On Tue, Jun 07, 2022 at 1:30 PM, Wojtek Mach <woj...@wojtekmach.pl> wrote:

The  --/2 operator already does this. :)

iex(1)> [:a, :b, :c, :d, :e] -- [:a, :b]

[:c, :d, :e]

On 7 Jun 2022, at 17:31, Randson <orandson@gmail.com> wrote:

Currently, the function `List.delete` only works for a single field. What I want to add is the possibility to delete multiple fields by passing a list of fields I want to remove.

Can be like this one:

```elixir

List.delete([:a, :b, :c, :d, :e], [:a, :b])

#=> [:c, :d, :e]

```

Or, it can be a new function to totally deal with that. like:

```elixir

List.delete_many([:a, :b, :c, :d, :e], [:a, :b])

#=> [:c, :d, :e]

```

What do you guys think about that?

Cheers,

Randson

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