Claude-skill-registry functional-programming

Name: functional-programming
Author: majiayu000

Use when writing functional code - covers FP best practices (Lea differs from traditional FP languages)

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/functional-programming" ~/.claude/skills/majiayu000-claude-skill-registry-functional-programming && rm -rf "$T"

manifest: skills/data/functional-programming/SKILL.md

source content

Functional Programming Best Practices

Quick Start

-- Prefer pure functions and immutable data
let double = (x) -> x * 2
[1, 2, 3] /> map(double) /> filter((x) -> x > 2)

Core Principles

Immutability: Use
```
let
```
by default,
```
maybe
```
only when mutation is necessary
Pure functions: No side effects, same input always produces same output
Composition: Build complex behavior from simple, composable functions
Higher-order functions: Pass functions as arguments, return functions

Lea-Specific Warnings

Lea differs from traditional FP languages:

No currying - Use placeholders:
```
5 /> add(3, input)
```
Pipes prepend -
```
x /> fn(a)
```
becomes
```
fn(x, a)
```
Mutable bindings -
```
maybe
```
allows mutation; avoid unless necessary
No monads - Async uses
```
#async
```
decorator instead
Opt-in types - Add
```
:: Type :> ReturnType
```
, use
```
#strict
```
for enforcement

Notes

Prefer
```
let
```
over
```
maybe
```
Use pipelines (
```
/>
```
) for left-to-right data flow
Callbacks receive
```
(element, index)
```