Dictionary<TKey, TValue> uses an IEqualityComparer<TKey> for comparing the keys. If you do not explicitly specify the comparer when you construct the dictionary, it will use EqualityComparer<TKey>.Default. Since neither MyClass nor MyStruct implement IEquatable<T>, the default equality comparer will call Object.Equals and Object.GetHashCode for comparing instances. MyClass is derived from Object, so the implementation will use … Read more
I feel an answer with easily verifiable evidence would be best. These operations are so small that it is difficult to performance test them. == 1648 true === 1629 true control test 1575 true If you subtract off the control test, it looks like there is a ~30% difference in their speeds on my browser. … Read more
if (iar1 == iar2) Here iar1 and iar2 are decaying to pointers to the first elements of the respective arrays. Since they are two distinct arrays, the pointer values are, of course, different and your comparison tests not equal. To do an element-wise comparison, you must either write a loop; or use std::array instead std::array<int, … Read more
They are fundamentally different. == compares by calling the __eq__ method is returns true if and only if the two references are to the same object So in comparision with say Java: is is the same as == for objects == is the same as equals for objects
As you suspect, you’re returning the match of the first property seen. You should return false if that property doesn’t match, but keep looking otherwise. Also, return false if there’s no prop property found on y (that is, the counts match, but not the actual properties). If all properties have matched, return true: var deepEqual … Read more
Perhaps you are looking for the IsNaN static function? Try something like this: if (!Double.IsNaN(Price_Foreign)) { output.Append(spacer); output.Append(String.Format(“{0,-10:C} USD”,Price_Foreign)); }
In Scala you can use == for equality scala> “scala c++” == “scala java” res0: Boolean = false scala> “scala c++” == “scala java c++” res1: Boolean = false scala> “scala c++” == “scala c++” res2: Boolean = true The == method is defined in the AnyRef class. Since the methods first checks for null … Read more
Like this: case when FirstEvent.TitleID = SecondEvent.TitleID then 1 else 0 end as titlesSameCheck
Tuples require the following to be true for the objects to be considered “equal”: Must be a Tuple object with the same number of generic parameter(s) as the current object. Each of those generic parameters must be of the same type as the other. Each member of the tuple must have the same value as … Read more
The reason the equality for A is being invoked for an Array<A> that contains B is that overloading of free functions is resolved statically, not dynamically – that is, at compile time based on the type, not at runtime based on the pointed-to value. This is not surprising given == is not declared inside the … Read more