Reader overview

Utility functions to accommodate fp-ts/Reader.

Added in v0.15.0

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Table of contents

• 3 Functions
  • runReader

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3 Functions

runReader

Runs a Reader and extracts the final value from it.

Signature

export declare const runReader: <R, A>(r: R) => (reader: Reader<R, A>) => A

runReader :: r -> Reader r a -> a

Example

import { runReader } from 'fp-ts-std/Reader'
import { pipe } from 'fp-ts/function'
import * as R from 'fp-ts/Reader'

type Env = { dependency: string }
const env: Env = { dependency: 'dependency ' }
const extractedValue = pipe(R.of<Env, number>(1), runReader(env))
assert.strictEqual(extractedValue, 1)

Added in v0.15.0