Skip to main content

Function: isDefined()

isDefined<T>(value): value is NonNullable<T>

Defined in: predicate/guards/index.ts:227

Type guard that checks if a value is not null or undefined.

Narrows out null and undefined from the type.

Type Parameters​

T​

T

Parameters​

value​

T

The value to check

Returns​

value is NonNullable<T>

True if value is not null or undefined

Example​

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

const values: Array<string | null | undefined> = ['hello', null, 'world', undefined]
const defined = R.filter(values, isDefined) // type: string[]
// => ['hello', 'world']

See​

isNullish - for the inverse