What do you call “X <= $foo <= Y" comparison?

While writing a Perl statement like if ( $foo >= X && $foo <= Y ) yet again, I wondered why many programming languages do not support the more comfortable form if ( X <= $foo <= Y ) and what this is called. I came up with “3-legged comparison” but no results when searching for it. By the way there is also the “element-of-set” form if ( $foo in X..Y ) which I only consider more readable when provided via a short keyword.

When to use identity comparison instead of equals?

I wonder why would anybody want to use identity comparison for fields in equals, like here (Java syntax):

How representative is Ohloh? [closed]

Closed 10 years ago.

I need some help creating a non-binary tree (or some other data structure that will better solve my problem)

I have about ten lists of numbers and some strings. Each list has about <= 30K lines. Each line on a list has a distinct number.

Are Scrum and XP comparable things or are they used for different things

Are Scrum and XP comparable things or are they used for different things? what is the main features of each of them? how do they overlap?

Scala as a language for Generic Programming

In the paper “An Extended Comparative Study of Language Support for Generic Programming” by Garcia et al. an interesting comparison of programming languages features for generic programming is given:

Tricky compareTo, inheritance, easy to extend – Java

Let’s say we have 4 classes A, B, C, D where: A is a superclass of both B and C and C is a superclass of D. I suppose, in a diagram, it should look like this:

Best practice to sort then reverse, or write “backwards” comparator?

I wrote a comparator for a custom class of mine and when I ran my code I realised the output of my list of these objects was in the reverse order as to what I wanted. It was “ascending” as opposed to “descending”. This was because I stuck to the spec of compare where a return value of less than 0 means the other object is less than this and so on.

Trying to understand the 2N lnN compares for quicksort

I was going through the analysis of quicksort in Sedgewick’s Algorithms book. He creates the following recurrence relation for number of compares in quicksort while sorting an array of N distinct items.

Trying to understand the 2N lnN compares for quicksort

I was going through the analysis of quicksort in Sedgewick’s Algorithms book. He creates the following recurrence relation for number of compares in quicksort while sorting an array of N distinct items.