From antigravity-awesome-skills
Quick reference for Option type. Use when user needs to handle nullable values, optional data, or wants to avoid null checks.
npx claudepluginhub absjaded/antigravity-awesome-skillsThis skill uses the workspace's default tool permissions.
Option = value that might not exist. `Some(value)` or `None`.
Verifies tests pass on completed feature branch, presents options to merge locally, create GitHub PR, keep as-is or discard; executes choice and cleans up worktree.
Guides root cause investigation for bugs, test failures, unexpected behavior, performance issues, and build failures before proposing fixes.
Writes implementation plans from specs for multi-step tasks, mapping files and breaking into TDD bite-sized steps before coding.
Option = value that might not exist. Some(value) or None.
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)
O.map(fn) // Transform inner value
O.flatMap(fn) // Chain Options (fn returns Option)
O.filter(predicate) // None if predicate false
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
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')
)
// ❌ 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')
)
Use Option when you need to chain operations on optional values.