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https://github.com/oliverbooth/X10D
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Add T.RepeatValue(int)
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@ -1,4 +1,4 @@
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using X10D.Core;
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namespace X10D.Tests.Core;
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@ -49,5 +49,28 @@ public class CoreTests
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Assert.IsNotNull(enumerable);
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Assert.AreEqual(o, enumerable.ElementAt(0));
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}
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[TestMethod]
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[DataRow(1)]
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[DataRow("f")]
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[DataRow(true)]
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public void RepeatValue_ShouldContainRepeatedValue_GivenValue(object o)
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{
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IEnumerable<object> enumerable = o.RepeatValue(10);
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Assert.IsNotNull(enumerable);
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object[] array = enumerable.ToArray();
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Assert.AreEqual(10, array.Length);
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CollectionAssert.AreEqual(new[] {o, o, o, o, o, o, o, o, o, o}, array);
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}
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[TestMethod]
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[DataRow(1)]
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[DataRow("f")]
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[DataRow(true)]
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public void RepeatValue_ShouldThrow_GivenNegativeCount(object o)
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{
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// we must force enumeration via ToArray() to ensure the exception is thrown
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Assert.ThrowsException<ArgumentOutOfRangeException>(() => o.RepeatValue(-1).ToArray());
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}
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}
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@ -1,4 +1,4 @@
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namespace X10D.Core;
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namespace X10D.Core;
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/// <summary>
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/// Extension methods which apply to all types.
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@ -30,4 +30,25 @@ public static class Extensions
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{
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yield return value;
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}
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/// <summary>
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/// Returns an enumerable collection containing the current value repeated a specified number of times.
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/// </summary>
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/// <param name="value">The value to repeat.</param>
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/// <param name="count">The number of times to repeat <paramref name="value" />.</param>
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/// <typeparam name="T">The type of <paramref name="value"/>.</typeparam>
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/// <returns>An enumerable collection containing <paramref name="value" /> repeated <paramref name="count" /> times.</returns>
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/// <exception cref="ArgumentOutOfRangeException"><paramref name="count" /> is less than 0.</exception>
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public static IEnumerable<T> RepeatValue<T>(this T value, int count)
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{
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if (count < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(count), ExceptionMessages.CountMustBeGreaterThanOrEqualTo0);
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}
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for (var i = 0; i < count; i++)
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{
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yield return value;
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}
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}
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}
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