# Functions with many parameters (8 or more)

*Code longer than it needs to be*: one of the ways AI coding agents bloat software, from lessloc's [pattern catalog](https://lessloc.org/patterns/index.md). lessloc catches it as [`long-params`](https://lessloc.org/guide/reference.md#tier-2).

## What makes functions with many parameters (8 or more) a bad practice?

The standards that call it a bad practice: [CWE-1064](https://cwe.mitre.org/data/definitions/1064.html) (ISO/IEC 5055 maintainability); Sonar S107; Clean Code F1 Too Many Arguments.

## What does lessloc do about functions with many parameters (8 or more)?

lessloc catches it as [`long-params`](https://lessloc.org/guide/reference.md#tier-2).

- `long-params` (tier 2): A new function with 8 or more parameters.

## Examples

Caught as `long-params`:

```python [bc.py]
def make_order(a, b, c, d, e, f, g, h):
    return a
```

Written well:

```python [bc.py]
def make_order(spec):
    return spec
```

## Related patterns

The other patterns in [Code longer than it needs to be](https://lessloc.org/patterns/index.md#code-longer-than-it-needs-to-be):

- [Brute-force idioms](https://lessloc.org/patterns/brute-force.md): lessloc catches it as `simpler`, built in for Python, JS/TS, Go, Rust, Java and C#. ruff (in every hook) and clippy (in `ci`) go deeper.
- [Hand-built counters and flag loops](https://lessloc.org/patterns/counters-and-flags.md): lessloc catches it as `simpler`.
- [A catch that only rethrows](https://lessloc.org/patterns/catch-rethrow.md): lessloc catches it as `simpler`.
- [A promise wrapped in new Promise](https://lessloc.org/patterns/promise-wrap.md): lessloc catches it as `simpler`.
- [Annotating types the compiler infers](https://lessloc.org/patterns/inferred-types.md): lessloc catches it as `simpler`.
- [A React Effect that only sets state from other values](https://lessloc.org/patterns/derived-effect.md): lessloc catches it as `simpler`.
- [Deep nesting](https://lessloc.org/patterns/deep-nesting.md): lessloc catches it as `deep-nesting`.
- [Long functions](https://lessloc.org/patterns/long-function.md): lessloc catches it as `long-function`.
- [If-chains on literal values](https://lessloc.org/patterns/if-chain.md): lessloc catches it as `if-chain`.
- [A file that keeps growing](https://lessloc.org/patterns/swollen-file.md): lessloc catches it as `swollen-file`.
- [Reformatting lines the task did not change](https://lessloc.org/patterns/churn.md): lessloc gives every session a rule against it and catches it as `churn`.
- [Net growth past a budget](https://lessloc.org/patterns/net-growth.md): lessloc catches it as `net-growth`.
- [Golfed code](https://lessloc.org/patterns/golfed-code.md): lessloc catches it as `clever` and `dense-lines`.