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Function: hasProperty()

hasProperty<T, K>(key): Predicate<T>

Defined in: predicate/builders/index.ts:239

Creates a predicate that tests if an object has a specific property.

Type Parameters​

T​

T extends Record<string, unknown>

K​

K extends string

Parameters​

key​

K

The property key to check for

Returns​

Predicate<T>

A predicate that returns true if the object has the property

Example​

import * as R from 'remeda'
import { hasProperty } from 'receta/predicate'

const objects = [
  { name: 'Alice', age: 25 },
  { name: 'Bob' },
  { name: 'Charlie', age: 30 }
]

R.filter(objects, hasProperty('age'))
// => [{ name: 'Alice', age: 25 }, { name: 'Charlie', age: 30 }]

// Real-world: Filter objects with optional properties
const users = [
  { id: 1, email: 'alice@example.com' },
  { id: 2 },
  { id: 3, email: 'charlie@example.com' }
]
R.filter(users, hasProperty('email')) // => users with email

See​

  • prop - for testing a property value
  • where - for testing multiple properties