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Showing content from https://dotnet.github.io/dotNext/api/DotNext.Optional-1.html below:

Struct Optional<T> | .NEXT

A container object which may or may not contain a value.

public readonly struct Optional<T> : IEquatable<Optional<T>>, IEquatable<T>, IStructuralEquatable, IOptionMonad<T, Optional<T>>, IOptionMonad<T>, ISupplier<object?>, IFunctional<Func<object?>>

Type of value.

Constructs non-empty container.

public Optional(T? value)

A value to be placed into the container.

Indicates whether the value is present.

public bool HasValue { get; }

Indicates that the value is null.

public bool IsNull { get; }

Indicates that the value is undefined.

public bool IsUndefined { get; }

Represents optional container without value.

public static Optional<T> None { get; }

If a value is present, returns the value, otherwise throw exception.

If a value is present, returns the value, otherwise default value.

public T? ValueOrDefault { get; }

The value, if present, otherwise default.

Gets an immutable reference to the value in the container.

[JsonIgnore]
public ref readonly T ValueRef { get; }

Boxes value encapsulated by this object.

public Optional<object> Box()

Concatenates optional values.

public Optional<(T, TOther)> Concat<TOther>(in Optional<TOther> other)

The optional value that is defined only when both containers have values.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

[CLSCompliant(false)]
public Optional<TResult> Convert<TResult>(delegate*<T, Optional<TResult>> mapper)

A mapping function to be applied to the value, if present.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of the result of the mapping function.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

[CLSCompliant(false)]
public Optional<TResult> Convert<TResult>(delegate*<T, Optional<TResult>> mapper)

A mapping function to be applied to the value, if present.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of the result of the mapping function.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

public Optional<TResult> Convert<TResult>(Converter<T, Optional<TResult>> mapper)

A mapping function to be applied to the value, if present.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of the result of the mapping function.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

public Optional<TResult> Convert<TResult>(Converter<T, TResult> mapper)

A mapping function to be applied to the value, if present.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of the mapping function result.

Converts the monad to Optional<T>.

public static Optional<T> Create<TMonad>(TMonad value) where TMonad : struct, IOptionMonad<T>

The value to convert.

The type of the monad.

Determines whether this container stores the same value as the specified one.

public bool Equals(Optional<T> other)

The container to compare.

true if this container stores the same value as other; otherwise, false.

Determines whether this container stores the same value as the specified one.

public override bool Equals(object? other)

The container to compare.

true if this container stores the same value as other; otherwise, false.

Performs equality check between stored value and the specified value using method Equals(object, object).

public bool Equals(object? other, IEqualityComparer comparer)

Other object to compare with Value.

The comparer implementing custom equality check.

true if other is equal to Value using custom check; otherwise, false.

Determines whether this container stored the same value as the specified value.

public bool Equals(T? other)

Other value to compare.

Computes hash code of the stored value.

public override int GetHashCode()

The hash code of the stored value.

Computes hash code for the stored value using method GetHashCode(object).

public int GetHashCode(IEqualityComparer comparer)

The comparer implementing hash code function.

The hash code of Value.

Gets an immutable reference to the value in the container.

[CLSCompliant(false)]
public ref readonly T GetReference(delegate*<Exception> exceptionFactory)

The factory used to produce exception if the container has no value.

The immutable reference to the value in the container.

Gets an immutable reference to the value in the container.

public ref readonly T GetReference(Func<Exception> exceptionFactory)

The factory used to produce exception if the container has no value.

The immutable reference to the value in the container.

Gets an immutable reference to the value in the container.

public ref readonly T GetReference<TException>() where TException : Exception, new()

The immutable reference to the value in the container.

The type of the exception to throw if the optional container has no value.

If a value is present, and the value matches the given predicate, return an Optional describing the value, otherwise return an empty Optional.

[CLSCompliant(false)]
public Optional<T> If(delegate*<T, bool> condition)

A predicate to apply to the value, if present.

An Optional describing the value of this Optional if a value is present and the value matches the given predicate, otherwise an empty Optional.

If a value is present, and the value matches the given predicate, return an Optional describing the value, otherwise return an empty Optional.

public Optional<T> If(Predicate<T> condition)

A predicate to apply to the value, if present.

An Optional describing the value of this Optional if a value is present and the value matches the given predicate, otherwise an empty Optional.

Determines whether the object represents meaningful value.

public static bool IsValueDefined(T? value)

The value to check.

Returns the value if present; otherwise return default value.

public T? Or(T? defaultValue)

The value to be returned if there is no value present.

The value, if present, otherwise defaultValue.

Returns the value if present; otherwise invoke delegate.

[CLSCompliant(false)]
public T OrInvoke(delegate*<T> defaultFunc)

A delegate to be invoked if value is not present.

The value, if present, otherwise returned from delegate.

Returns the value if present; otherwise invoke delegate.

public T OrInvoke(Func<T> defaultFunc)

A delegate to be invoked if value is not present.

The value, if present, otherwise returned from delegate.

If a value is present, returns the value, otherwise throw exception.

[CLSCompliant(false)]
public T OrThrow(delegate*<Exception> exceptionFactory)

Exception factory.

The value, if present.

If a value is present, returns the value, otherwise throw exception.

public T OrThrow(Func<Exception> exceptionFactory)

Exception factory.

The value, if present.

If a value is present, returns the value, otherwise throw exception.

public T OrThrow<TException>() where TException : Exception, new()

The value, if present.

Type of exception to throw.

Returns textual representation of this object.

public override string? ToString()

The textual representation of this object.

Attempts to extract value from this container if it is present.

public bool TryGet(out T? value)

Extracted value.

true if value is present; otherwise, false.

Attempts to extract value from this container if it is present.

public bool TryGet(out T? value, out bool isNull)

Extracted value.

true if underlying value is null; otherwise, false.

true if value is present; otherwise, false.

Returns non-empty container.

public static Optional<T> operator |(in Optional<T> first, in Optional<T> second)

The first container.

The second container.

The first non-empty container.

Returns the value if present; otherwise return default value.

public static T? operator |(in Optional<T> optional, T? defaultValue)

The optional value.

The value to be returned if there is no value present.

The value, if present, otherwise defaultValue.

Determines whether two containers store the same value.

public static bool operator ==(in Optional<T> first, in Optional<T> second)

The first container to compare.

The second container to compare.

true, if both containers store the same value; otherwise, false.

Determines whether two containers are empty or have values.

public static Optional<T> operator ^(in Optional<T> first, in Optional<T> second)

The first container.

The second container.

None, if both containers are empty or have values; otherwise, non-empty container.

Extracts value stored in the Optional container.

public static explicit operator T(in Optional<T> optional)

The container.

Checks whether the container has no value.

public static bool operator false(in Optional<T> optional)

true if this container has no value; otherwise, false.

Wraps value into Optional container.

public static implicit operator Optional<T>(T? value)

The value to convert.

Determines whether two containers store the different values.

public static bool operator !=(in Optional<T> first, in Optional<T> second)

The first container to compare.

The second container to compare.

true, if both containers store the different values; otherwise, false.

Checks whether the container has no value.

public static bool operator !(in Optional<T> optional)

true if this container has no value; otherwise, false.

Checks whether the container has value.

public static bool operator true(in Optional<T> optional)

true if this container has value; otherwise, false.

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