42 lines
1.1 KiB
C#
42 lines
1.1 KiB
C#
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using System;
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using System.Collections.Generic;
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namespace Swan {
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/// <summary>
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/// Functional programming extension methods.
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/// </summary>
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public static class FunctionalExtensions {
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/// <summary>
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/// Whens the specified condition.
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/// </summary>
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/// <typeparam name="T">The type of IEnumerable.</typeparam>
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/// <param name="list">The list.</param>
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/// <param name="condition">The condition.</param>
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/// <param name="fn">The function.</param>
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/// <returns>
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/// The IEnumerable.
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/// </returns>
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/// <exception cref="ArgumentNullException">
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/// this
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/// or
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/// condition
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/// or
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/// fn.
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/// </exception>
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public static IEnumerable<T> When<T>(this IEnumerable<T> list, Func<Boolean> condition, Func<IEnumerable<T>, IEnumerable<T>> fn) {
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if(list == null) {
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throw new ArgumentNullException(nameof(list));
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}
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if(condition == null) {
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throw new ArgumentNullException(nameof(condition));
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}
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if(fn == null) {
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throw new ArgumentNullException(nameof(fn));
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}
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return condition() ? fn(list) : list;
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}
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}
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}
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