fp-option-ref
Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.
Best use case
fp-option-ref is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.
Teams using fp-option-ref should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/fp-option-ref/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How fp-option-ref Compares
| Feature / Agent | fp-option-ref | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# Option Quick Reference
Option = value that might not exist. `Some(value)` or `None`.
## Create
```typescript
import * as O from 'fp-ts/Option'
O.some(5) // Some(5)
O.none // None
O.fromNullable(x) // null/undefined → None, else Some(x)
O.fromPredicate(x > 0)(x) // false → None, true → Some(x)
```
## Transform
```typescript
O.map(fn) // Transform inner value
O.flatMap(fn) // Chain Options (fn returns Option)
O.filter(predicate) // None if predicate false
```
## Extract
```typescript
O.getOrElse(() => default) // Get value or default
O.toNullable(opt) // Back to T | null
O.toUndefined(opt) // Back to T | undefined
O.match(onNone, onSome) // Pattern match
```
## Common Patterns
```typescript
import { pipe } from 'fp-ts/function'
import * as O from 'fp-ts/Option'
// Safe property access
pipe(
O.fromNullable(user),
O.map(u => u.profile),
O.flatMap(p => O.fromNullable(p.avatar)),
O.getOrElse(() => '/default-avatar.png')
)
// Array first element
import * as A from 'fp-ts/Array'
pipe(
users,
A.head, // Option<User>
O.map(u => u.name),
O.getOrElse(() => 'No users')
)
```
## vs Nullable
```typescript
// ❌ Nullable - easy to forget checks
const name = user?.profile?.name ?? 'Guest'
// ✅ Option - explicit, composable
pipe(
O.fromNullable(user),
O.flatMap(u => O.fromNullable(u.profile)),
O.map(p => p.name),
O.getOrElse(() => 'Guest')
)
```
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