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Linq fast indexOf
namespace System.Linq {
public static class EnumerableExtensions {
public static int IndexOf<T1>(this IEnumerable source, Func<T1, bool> predicate) {
var enumerator = source.GetEnumerator();
bool lastEval = false;
int index = -1;
while (enumerator.MoveNext() && !(lastEval = predicate(enumerator.Current))) {
//If the last evaluation is still false we broke the loop without finding anything
return lastEval ? index : -1;
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