effect-io-ai

Package: effect
Module: Predicate

Predicate.hasProperty

Checks whether a value has a given property key.

When to use

Use when you need a Predicate guard for property access on unknown values with a simple structural object check.

Details

Uses the in operator and isObjectKeyword. This does not check property value types.

Example (Guarding object properties)

import { Predicate } from "effect"

const hasName = Predicate.hasProperty("name")
const data: unknown = { name: "Ada" }

if (hasName(data)) {
  console.log(data.name)
}

See

• isTagged
• isObjectKeyword

Signature

declare const hasProperty: { <P extends PropertyKey>(property: P): (self: unknown) => self is { [K in P]: unknown; }; <P extends PropertyKey>(self: unknown, property: P): self is { [K in P]: unknown; }; }

Source

Since v2.0.0