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Questions tagged equality

48 questions

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13
votes
2
answers

C++ object equality

c++ pointers equality
asked 2013-05-30T18:22:23.920
21
votes
2
answers

Why don't methods have reference equality?

python methods identity equality
asked 2013-04-12T17:51:52.657
11
votes
3
answers

Java - strings equals when decompiled

java string optimization equality string-interning
asked 2013-04-11T20:45:25.710
97
votes
1
answers

double equals vs is in python

python comparison boolean equals equality
asked 2013-02-21T17:17:57.830
12
votes
1
answers

In C#, why Equals() method on arrays only compare their references, not their actual content

c# arrays reference equality
asked 2013-02-19T14:43:28.580
15
votes
2
answers

How is `Proc#==` evaluated?

ruby equality proc
asked 2013-01-23T19:17:40.523
9
votes
2
answers

Will the var members in case class affect case class's equality?

scala equality case-class algebraic-data-types
asked 2013-01-15T23:54:44.027
8
votes
3
answers

Why Java does not support Equality comparison on the Lines of Comparator?

java equality
asked 2012-09-12T14:14:14.250
21
votes
3
answers

Two different "strings" are the same object instance?

c# string reference equality
asked 2012-05-28T04:39:31.457
12
votes
7
answers

Finding duplicate entries in Collection

java collections duplicates equality
asked 2012-05-25T13:53:05.903
16
votes
3
answers

Why is == faster than eql?

ruby string benchmarking equality
asked 2012-04-21T07:20:50.140
15
votes
2
answers

How expensive is comparing two unordered sets for equality?

c++ set complexity-theory equality unordered-set
asked 2012-04-12T06:33:00.900
12
votes
2
answers

Checking for NaN presence in a container

python python-3.x containers equality nan
asked 2012-03-28T09:31:07.757
8
votes
3
answers

Why or how does this prove JavaScript array equality?

javascript arrays equality
asked 2012-02-17T19:30:15.640
135
votes
3
answers

Correct way to override Equals() and GetHashCode()

c# equality gethashcode
asked 2012-02-16T19:15:08.403
42
votes
5
answers

Set "in" operator: uses equality or identity?

python set identity operator-keyword equality
asked 2012-02-01T01:10:59.390
8
votes
7
answers

Result of calling IEquatable<T>.Equals(T obj) when this == null and obj == null?

c# .net f# equals equality
asked 2011-11-11T13:54:04.413
171
votes
5
answers

What's the difference between == and .equals in Scala?

scala equals equality scala-java-interop
asked 2011-10-06T22:23:46.577
12
votes
4
answers

Implementing a geographic coordinate class: equality comparison

c# geocoding equality
asked 2011-07-21T10:48:35.240
188
votes
9
answers

Difference between String#equals and String#contentEquals methods

java string equality
asked 2011-06-25T07:54:30.857
13
votes
1
answers

java: comparing classes with == or .equals(): is there a difference?

java class equality
asked 2011-05-13T21:10:39.673
21
votes
5
answers

Can I overload an == operator on an Interface?

c# .net interface equality iequatable
asked 2011-02-21T13:02:42.187
106
votes
5
answers

Determining Date Equality in Javascript

javascript date equality
asked 2011-01-03T18:16:27.580
23
votes
4
answers

3 Equals or Case Equality operator

ruby equality commutativity
asked 2010-12-24T16:11:09.343
129
votes
6
answers

How will Object's .equals and .hashCode will work for my classes?

java object equals hashcode equality
asked 2010-11-14T18:40:06.000
9
votes
6
answers

Cast to object before null check in overriding Equals

c# casting null equality
asked 2010-11-05T12:01:37.660
20
votes
9
answers

Using the equality operator == to compare two strings for equality in C

c string pointers equality equality-operator
asked 2010-10-14T13:27:35.103
107
votes
7
answers

C# .Equals(), .ReferenceEquals() and == operator

c# equality
asked 2010-10-06T05:02:35.593
32
votes
1
answers

isEqual doesn't always work for NSIndexPath? What can I use in its place?

objective-c equality iphone-sdk-3.2 nsindexpath
asked 2010-09-24T21:13:36.603
66
votes
2
answers

How do I check if two variables reference the same object in Python?

python equality
asked 2010-09-05T19:54:34.930
73
votes
6
answers

What problem does IStructuralEquatable and IStructuralComparable solve?

.net equality icomparable iequalitycomparer
asked 2010-08-31T14:09:45.363
17
votes
1
answers

Unexpected results with OCaml !=

ocaml equality
asked 2010-06-16T16:20:04.310
19
votes
8
answers

Floating point equality in Python and in general

python floating-point equality
asked 2010-06-15T21:15:40.807
20
votes
4
answers

How do I ignore the UTF-8 Byte Order Marker in String comparisons?

c# unit-testing visual-studio-2010 utf-8 equality
asked 2010-05-26T17:07:30.927
304
votes
3
answers

Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?

python boolean equality language-specifications
asked 2010-05-04T09:03:30.200
9
votes
3
answers

Equality relations in Scala

scala scala-2.8 equals equality scala-collections
asked 2010-02-26T12:55:37.043
88
votes
2
answers

Test for equality to the default value

c# generics equality
asked 2009-12-13T06:42:56.627
16
votes
3
answers

JavaScript: {}==false is a SyntaxError?

javascript syntax-error equality
asked 2009-10-02T13:34:46.330
324
votes
7
answers

How do you test to see if a double is equal to NaN?

java double equality nan
asked 2009-09-21T20:09:21.717
13
votes
11
answers

Is relational comparison between int and float directly possible in C?

c floating-point comparison equality
asked 2009-07-21T19:22:00.157
47
votes
3
answers

Implementing -hash / -isEqual: / -isEqualTo...: for Objective-C collections

objective-c cocoa data-structures equality chdatastructures
asked 2009-07-10T22:59:26.787
34
votes
3
answers

When should you use === vs ==, !== vs !=, etc.. in javascript?

javascript equality
asked 2009-07-07T20:02:20.513
10
votes
5
answers

set equality in linq

c# linq set equality
asked 2009-06-03T14:37:52.603
166
votes
8
answers

LINQ Select Distinct with Anonymous Types

c# linq distinct anonymous-types equality
asked 2009-02-12T21:46:57.497
10
votes
6
answers

How to compare two elements of the same but unconstrained generic type for equality?

c# class generics struct equality
asked 2008-12-03T11:44:41.190
272
votes
16
answers

Best practices for overriding isEqual: and hash

objective-c equality
asked 2008-10-31T17:22:25.783
1037
votes
77
answers

How can I determine equality for two JavaScript objects?

javascript object equality hashcode
asked 2008-10-14T13:41:07.357
49
votes
10
answers

What is "Best Practice" For Comparing Two Instances of a Reference Type?

c# .net comparison operator-overloading equality
asked 2008-09-19T18:07:02.760