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‎src/Extensions/ReadOnlySpan/Linq/First.cs‎

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using System;
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namespace SpanExtensions
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{
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public static partial class ReadOnlySpanExtensions
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{
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/>.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <returns>The first element in <paramref name="source"/>.</returns>
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/// <exception cref="InvalidOperationException"><paramref name="source"/> is empty.</exception>
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public static T First<T>(this ReadOnlySpan<T> source)
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{
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if(source.IsEmpty)
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{
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throw new InvalidOperationException($"{nameof(source)} cannot be empty.");
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}
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return source[0];
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}
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/> that satisfies a specified condition.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <param name="predicate">A function to test each element for a condition.</param>
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/// <returns>The first element in <paramref name="source"/> that passes the test in the specified <paramref name="predicate"/> function.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="predicate"/> is null.</exception>
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/// <exception cref="InvalidOperationException">No element satisfies the condition in <paramref name="predicate"/>. -or- <paramref name="source"/> is empty.</exception>
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public static T First<T>(this ReadOnlySpan<T> source, Predicate<T> predicate)
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{
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if(predicate is null)
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{
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throw new ArgumentNullException(nameof(predicate));
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}
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if(source.IsEmpty)
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{
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throw new InvalidOperationException($"{nameof(source)} cannot be empty.");
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}
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for(int i = 0; i < source.Length; i++)
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{
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T item = source[i];
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if(predicate(item))
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{
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return item;
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}
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}
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throw new InvalidOperationException("No element matched the specified condition.");
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}
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}
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}

‎src/Extensions/ReadOnlySpan/Linq/FirstOrDefault.cs‎

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using System;
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namespace SpanExtensions
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{
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public static partial class ReadOnlySpanExtensions
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{
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/>, or a specified default value if the <see cref="ReadOnlySpan{T}"/> contains no elements..
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <param name="defaultValue">The default value to return if <paramref name="source"/> is empty.</param>
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/// <returns><paramref name="defaultValue"/> if <paramref name="source"/> is empty; otherwise, the first element in <paramref name="source"/>.</returns>
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public static T FirstOrDefault<T>(this ReadOnlySpan<T> source, T defaultValue)
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{
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if(source.IsEmpty)
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{
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return defaultValue;
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}
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return source[0];
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}
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/> that satisfies a specified condition or a specified default value if no such element is found.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <param name="predicate">A function to test each element for a condition.</param>
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/// <param name="defaultValue">The default value to return if <paramref name="source"/> is empty.</param>
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/// <returns>default(T) if <paramref name="source"/> is empty or if no element passes the test specified by <paramref name="predicate"/>; otherwise, the first element in <paramref name="source"/> that passes the test specified by <paramref name="predicate"/>.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="predicate"/> is null.</exception>
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public static T FirstOrDefault<T>(this ReadOnlySpan<T> source, Predicate<T> predicate, T defaultValue)
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{
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if(predicate is null)
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{
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throw new ArgumentNullException(nameof(predicate));
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}
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if(source.IsEmpty)
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{
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return defaultValue;
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}
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for(int i = 0; i < source.Length; i++)
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{
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T item = source[i];
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if(predicate(item))
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{
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return item;
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}
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}
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return defaultValue;
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}
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#if NETCOREAPP1_0_OR_GREATER
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/>, or a specified default value if the <see cref="ReadOnlySpan{T}"/> contains no elements..
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <returns>default(T) if <paramref name="source"/> is empty; otherwise, the first element in <paramref name="source"/>.</returns>
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public static T? FirstOrDefault<T>(this ReadOnlySpan<T> source)
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{
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if(source.IsEmpty)
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{
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return default(T);
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}
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return source[0];
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}
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/> that satisfies a specified conditionor a default value if no such element is found.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <param name="predicate">A function to test each element for a condition.</param>
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/// <returns>default(T) if <paramref name="source"/> is empty or if no element passes the test specified by <paramref name="predicate"/>; otherwise, the first element in <paramref name="source"/>.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="predicate"/> is null.</exception>
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public static T? FirstOrDefault<T>(this ReadOnlySpan<T> source, Predicate<T> predicate)
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{
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if(predicate is null)
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{
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throw new ArgumentNullException(nameof(predicate));
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}
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if(source.IsEmpty)
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{
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return default(T);
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}
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for(int i = 0; i < source.Length; i++)
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{
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T item = source[i];
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if(predicate(item))
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{
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return item;
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}
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}
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return default(T);
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}
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#elif NETSTANDARD2_1
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#pragma warning disable CS8603 // Possible null reference return.
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/>, or a specified default value if the <see cref="ReadOnlySpan{T}"/> contains no elements..
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <returns>default(T) if <paramref name="source"/> is empty; otherwise, the first element in <paramref name="source"/>.</returns>
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public static T FirstOrDefault<T>(this ReadOnlySpan<T> source)
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{
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if(source.IsEmpty)
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{
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return default(T);
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}
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return source[0];
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}
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/// <summary>
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/// Returns the first element in a <see cref="ReadOnlySpan{T}"/> that satisfies a specified conditionor a default value if no such element is found.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the first element of.</param>
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/// <param name="predicate">A function to test each element for a condition.</param>
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/// <returns>default(T) if <paramref name="source"/> is empty or if no element passes the test specified by <paramref name="predicate"/>; otherwise, the first element in <paramref name="source"/>.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="predicate"/> is null.</exception>
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public static T FirstOrDefault<T>(this ReadOnlySpan<T> source, Predicate<T> predicate)
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{
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if(predicate is null)
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{
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throw new ArgumentNullException(nameof(predicate));
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}
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if(source.IsEmpty)
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{
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return default(T);
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}
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for(int i = 0; i < source.Length; i++)
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{
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T item = source[i];
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if(predicate(item))
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{
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return item;
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}
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}
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return default(T);
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}
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#pragma warning restore CS8603 // Possible null reference return.
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#endif
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}
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}

‎src/Extensions/ReadOnlySpan/Linq/Last.cs‎

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using System;
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namespace SpanExtensions
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{
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public static partial class ReadOnlySpanExtensions
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{
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/// <summary>
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/// Returns the last element in a <see cref="ReadOnlySpan{T}"/>.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the last element of.</param>
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/// <returns>The last element in <paramref name="source"/>.</returns>
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/// <exception cref="InvalidOperationException"><paramref name="source"/> is empty.</exception>
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public static T Last<T>(this ReadOnlySpan<T> source)
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{
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if(source.IsEmpty)
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{
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throw new InvalidOperationException($"{nameof(source)} cannot be empty.");
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}
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return source[^1];
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}
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/// <summary>
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/// Returns the last element in a <see cref="ReadOnlySpan{T}"/> that satisfies a specified condition.
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/// </summary>
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/// <typeparam name="T">The type of elements in <paramref name="source"/>.</typeparam>
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/// <param name="source">The <see cref="ReadOnlySpan{T}"/> to return the last element of.</param>
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/// <param name="predicate">A function to test each element for a condition.</param>
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/// <returns>The last element in <paramref name="source"/> that passes the test in the specified <paramref name="predicate"/> function.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="predicate"/> is null.</exception>
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/// <exception cref="InvalidOperationException">No element satisfies the condition in <paramref name="predicate"/>. -or- <paramref name="source"/> is empty.</exception>
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public static T Last<T>(this ReadOnlySpan<T> source, Predicate<T> predicate)
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{
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if(predicate is null)
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{
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throw new ArgumentNullException(nameof(predicate));
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}
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if(source.IsEmpty)
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{
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throw new InvalidOperationException($"{nameof(source)} cannot be empty.");
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}
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for(int i = source.Length - 1; i > 0; i--)
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{
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T item = source[i];
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if(predicate(item))
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{
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return item;
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}
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}
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throw new InvalidOperationException("No element matched the specified condition.");
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}
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}
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}

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