# `Tack.Credo.Check.NoCaptureOperator`
[🔗](https://github.com/giggleton/pica/blob/v0.1.0/dev/tack/credo/check/no_capture_operator.ex#L1)

## Basics

> #### This check is disabled by default. {: .neutral}
>
> [Learn how to enable it](`e:credo:config_file.html#checks`) via `.credo.exs`.

This check has a base priority of `normal` and works with any version of Elixir.

## Explanation

Anonymous functions are written out, never with the capture shorthand.

CLAUDE.md, Conventions:

> **No capture-operator anonymous functions.** Always write anonymous functions as
> `fn descriptive_name -> body end` — never the `&`/`&1` shorthand (e.g. `& &1.id`,
> `&(&1 + 1)`). `&Mod.fun/arity` references are ok. Prefer descriptive argument names
> over positional `&1`.

The convention buys the same thing the "no abbreviations" rule buys: at every call site
the argument has a name that says what it is, so a reader of `Enum.filter(bids, fn bid ->
bid.accepted? end)` never has to look up what `&1` was bound to.

    # not ok
    Enum.map(listings, & &1.code)
    Enum.filter(prices, &(&1 > 0))

    # ok
    Enum.map(listings, fn listing -> listing.code end)
    Enum.filter(prices, fn price -> price > 0 end)

    # ok — a named function reference is not an anonymous function
    Enum.map(codes, &String.upcase/1)
    Enum.reduce(amounts, 0, &Kernel.+/2)

## Check-Specific Parameters

*There are no specific parameters for this check.*

## General Parameters

Like with all checks, [general params](`e:credo:check_params.html`) can be applied.

Parameters can be configured via the [`.credo.exs` config file](`e:credo:config_file.html`).

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*Consult [api-reference.md](api-reference.md) for complete listing*