How to check if a variable is not null?
I know that below are the two ways in JavaScript to check whether a variable is not null, but I’m confused which is the best practice to use. Should I do: if (myVar) {…} or if (myVar !== null) {…} 9 Answers 9
comparison
Jackson Vs. Gson [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 years ago. Improve this question After searching through some existing libraries for JSON, I have finally ended up with these … Read more
Comparing two strings, ignoring case in C# [duplicate]
This question already has an answer here: What is difference between different string compare methods [duplicate] (1 answer) Closed 2 years ago. Which of the following two is more efficient? (Or maybe is there a third option that’s better still?) string val = “AStringValue”; if (val.Equals(“astringvalue”, StringComparison.InvariantCultureIgnoreCase)) OR if (val.ToLowerCase() == “astringvalue”) ? 8 Answers … Read more
How to compare dates in Java? [duplicate]
This question already has answers here: How do I check if a date is within a certain range? (16 answers) Closed 4 years ago. How do I compare dates in between in Java? Example: date1 is 22-02-2010 date2 is 07-04-2010 today date3 is 25-12-2010 date3 is always greater than date1 and date2 is always today. … Read more
Image comparison – fast algorithm
I’m looking to create a base table of images and then compare any new images against that to determine if the new image is an exact (or close) duplicate of the base. For example: if you want to reduce storage of the same image 100’s of times, you could store one copy of it and … Read more
Comparing date part only without comparing time in JavaScript
What is wrong with the code below? Maybe it would be simpler to just compare date and not time. I am not sure how to do this either, and I searched, but I couldn’t find my exact problem. BTW, when I display the two dates in an alert, they show as exactly the same. My … Read more
Optimum way to compare strings in JavaScript? [duplicate]
This question already has answers here: Is there a JavaScript strcmp()? (6 answers) Closed 9 years ago. I am trying to optimize a function which does binary search of strings in JavaScript. Binary search requires you to know whether the key is == the pivot or < the pivot. But this requires two string comparisons … Read more
Check if all elements in a list are identical
I need a function which takes in a list and outputs True if all elements in the input list evaluate as equal to each other using the standard equality operator and False otherwise. I feel it would be best to iterate through the list comparing adjacent elements and then AND all the resulting Boolean values. … Read more
What’s the difference between equal?, eql?, ===, and ==?
I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns true when both operands refer to exactly the same object. === by default also calls == which calls equal?… okay, so if all these three methods are not overridden, then I guess … Read more
String comparison in Python: is vs. == [duplicate]
This question already has answers here: Why does comparing strings using either ‘==’ or ‘is’ sometimes produce a different result? (15 answers) Closed 8 years ago. I noticed a Python script I was writing was acting squirrelly, and traced it to an infinite loop, where the loop condition was while line is not ”. Running … Read more
