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Err

A type representing the result of a failed computation.

This type is not intended to be used or instantiated directly. Instead, Err instances can be created with Result.err and can then be manipulated with any method available on Result.

Please see the Result documentation for more information.

Note:

All Err methods are documented at the Result level.

Type parameters

  • E

    The type of the value contained in this Err instance.

Hierarchy

Index

Methods

Methods

flatMap

  • flatMap<T, U>(func: function): Result<U, E>

getErr

getOk

isErr

  • isErr(): boolean

isOk

  • isOk(): boolean

map

  • map<T, U>(func: function): Result<U, E>

  • Type parameters

    • T

    • U

    Parameters

    • func: function
        • (val: T): U

        • Parameters

          • val: T

          Returns U

    Returns Result<U, E>

mapErr

  • mapErr<T, F>(func: function): Result<T, F>

  • Type parameters

    • T

    • F

    Parameters

    • func: function
        • (val: E): F

        • Parameters

          • val: E

          Returns F

    Returns Result<T, F>

match

  • match<T, U, F>(options: ResultMatch<T, E, U, F>): U | F

orElse

  • orElse<T, F>(func: function): Result<T, F>

toString

  • toString(): string

unwrap

  • unwrap<T>(message?: undefined | string): never

  • Type parameters

    • T

    Parameters

    • Optional message: undefined | string

    Returns never

unwrapErr

  • unwrapErr(message: string): E

unwrapOr

  • unwrapOr<T>(other: T): T

unwrapOrElse

  • unwrapOrElse<T>(func: function): T

Static err

  • err<F>(error: F): Result<any, F>

  • Creates an Err with the given value.

    const one = Result.err(1);
// one.unwrapErr() === 1

    Type parameters

    • F

      The type of value that the new Err will contain.

    Parameters

    • error: F

      The value with which to create the Err instance.

    Returns Result<any, F>

    An Err instance containing value.

Static ok

  • ok<U>(value: U): Result<U, any>

  • Creates an Ok with the given value.

    const one = Result.ok(1);
// one.unwrap() === 1

    Type parameters

    • U

      The type of value that the new Ok will contain.

    Parameters

    • value: U

      The value with which to create the Ok instance.

    Returns Result<U, any>

    An Ok instance containing value.

Legend

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  • Interface with type parameter
  • Constructor
  • Property
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  • Class with type parameter
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  • Private property
  • Private method
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  • Static property
  • Static method

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