Function or

  • Provide a fallback for a given Result. Behaves like a logical or: if the result value is an Ok, returns that result; otherwise, returns the defaultResult value.

    This is useful when you want to make sure that something which takes a Result always ends up getting an Ok variant, by supplying a default value for the case that you currently have an Err.

    import { ok, err, Result, or } from 'true-utils/result';

    const okA = ok<string, string>('a');
    const okB = ok<string, string>('b');
    const anErr = err<string, string>(':wat:');
    const anotherErr = err<string, string>(':headdesk:');

    console.log(or(okB, okA).toString()); // Ok(A)
    console.log(or(anErr, okA).toString()); // Ok(A)
    console.log(or(okB, anErr).toString()); // Ok(B)
    console.log(or(anotherErr, anErr).toString()); // Err(:headdesk:)

    Type Parameters

    • T

    • E

    • F

    Parameters

    • defaultResult: Result<T, F>

      The Result to use if result is an Err.

    • result: Result<T, E>

      The Result instance to check.

    Returns Result<T, F>

    result if it is an Ok, otherwise defaultResult.

    Typeparam

    T The type wrapped in the Ok case of result.

    Typeparam

    E The type wrapped in the Err case of result.

    Typeparam

    F The type wrapped in the Err case of defaultResult.

  • Type Parameters

    • T

    • E

    • F

    Parameters

    Returns ((result) => Result<T, F>)

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