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Christopher Pfohl
javascript collections backbone.js equals
I have a model that has a bunch of attributes but the two of interest here are id and key. key is always unique, id not so much. When I try to add more than one model with the same id to a collection, I get this error:Uncaught Error: Can’t add the same model to a collection twiceI am guessing this is because backbone is using the id to decide if two models are ===. Is that correct? If so is there a way to override this behaviour without swapping the name of the id and key attributes? I tried mes
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Dave Mateer
c# .net equals bitarray
I need something a little more than the System.Collections.BitArray class in my application. Specifically, I need the bit array:To be immutable To implement equality using value semanticsI created my own struct, largely copying the internals of the BitArray implementation. (Thanks, .Net Reflector!)I don’t deal everyday with bitwise operations, so I don’t have the highest degree of confidence in my equality implementation. (It’s passing the unit tests I am throwing at it, but I may be missing edg
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Mathijs Flietstra
javascript json string object equals
I am developing this website layout for http://myttc.ca. I was successful at retrieving most of the data and displaying it on the page.But when I had to filter my search to find only the stop names that had only Subways, I get stuck with errors. Here is the JSON page, http://myttc.ca/finch_station.json. Here, when I try to access only the stops having the route name as Yonge-University-Spadina Subway, I get an error saying Uncaught TypeError: Cannot call method ‘equals’ of undefined. I also trie
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user1270438
c++ equals
i was asked to implement a c++ code to perform the assignment x=y without the = sign and without functions. I have used the memcpy:int main(int argc, char *argv[]) {int x(5),y(3);memcpy(&x,&y,sizeof(y));printf(“%d”,x);getchar();return 0; }any other generic solutions?Thanks
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John Threepwood
c# equals
In C Sharp .NET there is a Equals method and a SetEquals method. Where is the difference?Coming from Java, my first thought was that SetEquals is not necessary, just use the Equals method for all objects.
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user2759565
java equals
I am posting a chunk of problematic code here. I am trying to compare two object types and their values simultaneously.public boolean equals(Object val1) {if (!(val1 instanceof ParentClass))return false;ParentClass val2 = (ParentClass) val1;if ((val1.getClass().equals(val2.getClass())) && val1.getVal().equals(val2.getVal()));System.out.println(“Both objects belong to same class and the values are equal too!!”);return true;}I have this chunk in my parent class and i am getting errors(The
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David M
java hashmap equals hashcode
I have this test code:import java.util.*;class MapEQ {public static void main(String[] args) {Map<ToDos, String> m = new HashMap<ToDos, String>();ToDos t1 = new ToDos(“Monday”);ToDos t2 = new ToDos(“Monday”);ToDos t3 = new ToDos(“Tuesday”);m.put(t1, “doLaundry”);m.put(t2, “payBills”);m.put(t3, “cleanAttic”);System.out.println(m.size()); } }class ToDos{String day;ToDos(String d) { day = d; }public boolean equals(Object o) {return ((ToDos)o).day == this.day;}// public int hashCode() {
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Evan
jquery height accordion collapse equals
Thanks to @ifaour for a lot of his help! This script includes:Jquery accordion using unordered lists. Active and Inactive states with toggling bullet arrow images Expand All / Collapse All that swaps its text. Equal height columns that expand and collapse when the accordion expands and collapsesYou can view a demo here http://jsbin.com/ucobo3/24/(function($) { $.fn.equalHeights = function(minHeight, maxHeight) { tallest = (minHeight) ? minHeight : 0; this.each(function() { if($(this).height() &g
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Grammin
java arrays object equals
I have two object arrays like so:Object[] array1 = {0, 1, 2, 3}; Object[] array2 = {0, 1, 2, 3};I would like to know if the arrays are equal. I’m defining equal as every value in array1 is the same as the value in that position in the array2. So these two arrays would be equal. What is the best why to find out if these two arrays are equal?if(array1 == array2) is not a deep equals so that won’t work and I don’t know if looping over each element and comparing them is the best and most efficient
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MonteCristo
arrays perl compare equals match
I have 2 arrays@a = qw/ A B C D E /;@b = qw/ B B C A /; I need to check if the same element appear in the same position of each arraye.g. $a[2] = “B”;$b[3] = “C”;if so count the number of times this happened it need to disregard any blank elementse.g.$a[6] = ;$b[6] = ;comments are most appreciated I like to understand the script.I tried intersect eq == cmp etc but I can’t quite get it and not quite sureThanks in advance.Here’s my code so far:#!/usr/bin/perl -wmy @a = <FILE1>
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Trang Q. Nguyen
equals transformation winbugs
Would someone please let me know what the equals function in WinBUGS return if one of the elements in the equals brackets is NA?Specifically, I want to do the transformation:for(i in 1:N){newvar[i] <- 1*equals(oldvar[i],0) + 2*equals(oldvar[i],1.5) + 3*equals(oldvar[i],4) + 4*equals(oldvar[i],8) }and want to preserve NA’s, so records with NA in oldvar[i] also has NA in newvar[i], but I am afraid that this tranformation turns NA’s into 0’s.Any and all advice is much appreciated.Trang
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K.Barad
java arraylist override equals
I’m having a problem with getting an ArrayList to correctly use an overriden equals. the problem is that I’m trying to use the equals to only test for a single key field, and using ArrayList.contains() to test for the existence of an object with the correct field. Here is an examplepublic class TestClass {private static class InnerClass{ private final String testKey;//data and suchInnerClass(String testKey, int dataStuff) {this.testKey =testKey;//etc}@Overridepublic boolean equals (Object
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Eric Mance
java oop class equals
need some help here. Working on “Classes and Object-Oriented Development” and could use some help with both my logic and code for a question in the textbook.Question: I am asked to Modify my previous example of my Rectangle class to override the equals() and toString() methods. Two rectangles are equal when they both have the same length and width.My approach: I tried to change it to do this, and then decided it would be easier to compare by areas, rather than comparing both by width and length,
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leppie
c# .net f# equals equality
What should IEquatable<T>.Equals(T obj) do when this == null and obj == null?1) This code is generated by F# compiler when implementing IEquatable<T>. You can see that it returns true when both objects are null:public sealed override bool Equals(T obj){if (this == null){return obj == null;}if (obj == null){return false;}// Code when both this and obj are not null.}2) Similar code can be found in the question “in IEquatable implementation is reference check necessary” or in the questi
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nano7
java multithreading arraylist equals hashcode
Ive got one question. What happens when I try to add the “same” object twice to an ArrayList. With “the same” I mean an object of an individual class, which is identified as the same with equals() and hashCode(). It has different values for most of the member variables and was created from maybe different threads, but for equals() and hashCode() its the “same”. Does the second object then replace the first object?Also, what happens if two threads try to add those objects exactly at the same time
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cellige
mysql null operators equals equals-operator
MySql provides a nice operator <=> that works with comparisons that could contain a null such as null <=> null or null <=> 5 etc giving back intuitive results as many programming languages. Where as the normal equals operator always just returns null, which catches many new MySql users such as myself awry.Is there a reason MySql has both and not JUST the functionality in <=> ? Who really needs an operator that is effectively undefined with built in language types?
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Kazark
javascript equals equality
I’ve just been looking at the _.isEqual function of Underscore.js and a section of the code goes something like this:if (a === b) return true;if (typeof a !== typeof b) return false;if (a == b) return true;I’m just wondering if there’s any case where the third statement could be reached and evaluate to true?Edit: Just to be clear, this isn’t my own code I’m talking about, I’m reading the source of Underscore, in particular, this line and I was curious about why they’re doing that.
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polygenelubricants
java null equals nullpointerexception
The contract of equals with regards to null, is as follows:For any non-null reference value x, x.equals(null) should return false.This is rather peculiar, because if o1 != null and o2 == null, then we have:o1.equals(o2) // returns false o2.equals(o1) // throws NullPointerExceptionThe fact that o2.equals(o1) throws NullPointerException is a good thing, because it alerts us of programmer error. And yet, that error would not be catched if for various reasons we just switched it around to o1.equals(
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Jeremy Banks
android multithreading string compare equals
if (result.equalsIgnoreCase(“300 OK”)){Log.d(result, “in 300 OK BUT UNKNOWN : “+ result);MyGPS.location_info = “Unknown”; }else if (result.equalsIgnoreCase(“400 ERROR”))Log.d(result, “400 ERROR : “+ result); else Log.d(result, “else : “+ result);Above is a simple test that result is “300 OK”.The problem is that when I expect “300 OK”…07-29 14:06:56.126: VERBOSE/doing background(5807): 300 OK…it actually goes to the else case…07-29 14:07:00.494: DEBUG/(5807): else : 300 OKWhy does it do thi