Equivalence Class Testing EC Testing is when you have a number of test items (e.g. values) that you want to test but because of cost (time/money) you do not have time to test them all. Therefore you group the test item into class where all items in each class are suppose to behave exactly the … Read more
It’s supposed to be symmetric. However, there is an asymmetric case in some versions of IE: window == document; // true document == window; // false
” == ‘0’ // false The left hand side is an empty string, and the right hand side is a string with one character. They are false because it is making a comparison between two un identical strings (thanks Niall). 0 == ” // true Hence, why this one is true, because 0 is falsy … Read more
I’ll answer this question incrementally. Let’s start with the = equivalence predicate. The = predicate is used to check whether two numbers are equal. If you supply it anything else but a number then it will raise an error: (= 2 3) => #f (= 2.5 2.5) => #t (= ‘() ‘()) => error The … Read more
The Go library has already got you covered. Do this: import “reflect” // m1 and m2 are the maps we want to compare eq := reflect.DeepEqual(m1, m2) if eq { fmt.Println(“They’re equal.”) } else { fmt.Println(“They’re unequal.”) } If you look at the source code for reflect.DeepEqual‘s Map case, you’ll see that it first checks … Read more
This is a great example of why the __dunder__ methods should not be used directly as they are quite often not appropriate replacements for their equivalent operators; you should use the == operator instead for equality comparisons, or in this special case, when checking for None, use is (skip to the bottom of the answer … Read more
There are a couple of ways. My preferred way is to attach a function to the ajaxStart/Stop events on the element itself. $(‘#loadingDiv’) .hide() // Hide it initially .ajaxStart(function() { $(this).show(); }) .ajaxStop(function() { $(this).hide(); }) ; The ajaxStart/Stop functions will fire whenever you do any Ajax calls. Update: As of jQuery 1.8, the documentation … Read more
Consider this simple problem: class Number: def __init__(self, number): self.number = number n1 = Number(1) n2 = Number(1) n1 == n2 # False — oops So, Python by default uses the object identifiers for comparison operations: id(n1) # 140400634555856 id(n2) # 140400634555920 Overriding the __eq__ function seems to solve the problem: def __eq__(self, other): “””Overrides … Read more