csharp / intermediate
Snippet
Deferred Execution with 'yield return'
The 'yield return' statement indicates that the method is an iterator. It provides a value to the enumerator without generating the entire collection in memory at once, enabling efficient processing of large data sets.
snippet.cs
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public IEnumerable<int> GetEvenNumbers(int max){for (int i = 0; i <= max; i++){if (i % 2 == 0) yield return i;}}
Breakdown
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IEnumerable<int>
The return type must be an interface that supports iteration, such as IEnumerable.
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yield return i
Returns the current value and pauses the method execution until the next element is requested by the caller.