equality

问题 From what I understand, records are actually classes that implement their own equality check in a way that your object is value-driven and not reference driven. In short, for the record Foo that is implemented like so: var foo = new Foo { Value = "foo" } and var bar = new Foo { Value = "foo" } , the foo == bar expression will result in True , even though they have a different reference ( ReferenceEquals(foo, bar) // False ). Now with records, even though that in the article posted in .Net

问题 I need to check if an array contains at least one or more elements of another array and print them out in swift. This is my situation: var array1 = ["user1", "user2", "user3", "user4"] var array2 = ["user3, "user5", "user7", "user9, "user4"] //I need to get back an array that says that both the arrays contains ex. "user3" and "user4" I searched the web but i only found the opposite answer that helps t check if there is a difference between 2 arrays using array.symmetricDifference() Any helps?

问题 Here is my class: public class MyClass { public string Name { get; set; } public string FaminlyName { get; set; } public int Phone { get; set; } } Then I have two similar list: List<MyClass> list1 = new List<MyClass>() { new MyClass() {FaminlyName = "Smith", Name = "Arya", Phone = 0123}, new MyClass() {FaminlyName = "Jahani", Name = "Shad", Phone = 0123} }; List<MyClass> list2 = new List<MyClass>() { new MyClass() {FaminlyName = "Smith", Name = "Arya", Phone = 0123}, new MyClass()

问题 Somewhat similar question here: Difference between C# and VB.Net string comparison ...but not the same as the one I am asking now. I am creating a simple expression walker that will convert a lambda into an SQL WHERE clause. I call it like this: GetEntities<MyEntity>(e => e.MyProperty == MyValue) C# creates the expression as I would expect which is a BinaryExpression consisting of a MemberExpression on the left and a ConstantExpression on the right which looks like this: $e.MyProperty ==

问题 Is there a way to test anonymous function equality with jest@20 ? I am trying to pass a test similar to: const foo = i => j => {return i*j} const bar = () => {baz:foo(2), boz:1} describe('Test anonymous function equality',()=>{ it('+++ foo', () => { const obj = foo(2) expect(obj).toBe(foo(2)) }); it('+++ bar', () => { const obj = bar() expect(obj).toEqual({baz:foo(2), boz:1}) }); }); which currently yields: ● >>>Test anonymous function equality › +++ foo expect(received).toBe(expected)

问题 I have found this (personally) convenient answer that fits my needs: https://stackoverflow.com/a/6713782/2678218 But since I am using TypeScript , I can have something like this with Generics : private equals<T>(x: T, y: T) { if (x === y) { return true; // if both x and y are null or undefined and exactly the same } else if (!(x instanceof Object) || !(y instanceof Object)) { return false; // if they are not strictly equal, they both need to be Objects } else if (x.constructor !== y

问题 Given any two classes, e.g. ClassA and ClassB below: class ClassA { private int intA; private String strA; private boolean boolA; // Constructor public ClassA (int intA, String strA, boolean boolA) { this.intA = intA; this.strA = strA; this.boolA = boolA; } // Getters and setters etc. below... } class ClassB { private int intB; private String strB; private boolean boolB; // Constructor public ClassB (int intB, String strB, boolean boolB) { this.intB = intB; this.strB = strB; this.boolB =

问题 Given any two classes, e.g. ClassA and ClassB below: class ClassA { private int intA; private String strA; private boolean boolA; // Constructor public ClassA (int intA, String strA, boolean boolA) { this.intA = intA; this.strA = strA; this.boolA = boolA; } // Getters and setters etc. below... } class ClassB { private int intB; private String strB; private boolean boolB; // Constructor public ClassB (int intB, String strB, boolean boolB) { this.intB = intB; this.strB = strB; this.boolB =

问题 When in a Python interactive session: In [1]: a = "my string" In [2]: b = "my string" In [3]: a == b Out[3]: True In [4]: a is b Out[4]: False In [5]: import sys In [6]: print(sys.version) 3.5.2 (default, Nov 17 2016, 17:05:23) [GCC 5.4.0 20160609] On the other hand, when running the following program: #!/usr/bin/env python import sys def test(): a = "my string" b = "my string" print(a == b) print(a is b) if __name__ == "__main__": test() print(sys.version) The output is: True True 3.5.2

问题 When in a Python interactive session: In [1]: a = "my string" In [2]: b = "my string" In [3]: a == b Out[3]: True In [4]: a is b Out[4]: False In [5]: import sys In [6]: print(sys.version) 3.5.2 (default, Nov 17 2016, 17:05:23) [GCC 5.4.0 20160609] On the other hand, when running the following program: #!/usr/bin/env python import sys def test(): a = "my string" b = "my string" print(a == b) print(a is b) if __name__ == "__main__": test() print(sys.version) The output is: True True 3.5.2