Clojure STM has 3 big unique features: Implements MVCC snapshot avoiding transactions restarts on read invalidation. Ensures references on read-writes provides a kind of manual control over resource acquisition order. Has explicit commute which reduces retries on commutative writes.
If you want to do this to an object that has been already logged (one time thing), chrome console offers a good solution. Hover over the printed object in the console, right click, then click on “Store as Global Variable”. Chrome will assign it to a temporary var name for you which you can use … Read more
Lisp is a very vague concept. I see two more or less useful interpretations: Lisp as a family of languages which share some common ideas. In a wide interpretation very different languages belong to this family: Common Lisp, Scheme, Logo, Dylan, Emacs Lisp, Clojure, RLisp, 3Lisp and many, many others. Lisp as a lineage of … Read more
I’ve done pretty extensive development in Ruby and Groovy (as well as a little Jython using Grinder as a load testing tool). Of the 3, I prefer Groovy the most. I like the closure syntax the best and I think that it has the tightest integration in how it works with other java classes on … Read more
I took a look at some of the stuff in the latest Fortran standards, and frankly I’m impressed. A lot of what I hated about the language 20 years ago is gone now. No more line numbers and special columns (may they burn in hell). Fortran has been heavily used in engineering circles for 50 … Read more
If you want to get n elements from the end of an array simply fetch the elements from -n to -1: PS C:\> $a = 0,1,2,3 PS C:\> $n = 2 PS C:\> $a[-$n..-1] 2 3 Edit: PowerShell doesn’t support indexing relative to both beginning and end of the array, because of the way $a[$i..$j] … Read more
You should initialize variables to None and then check it: var1 = None if var1 is None: var1 = 4 Which can be written in one line as: var1 = 4 if var1 is None else var1 or using shortcut (but checking against None is recommended) var1 = var1 or 4 alternatively if you will … Read more
if (!count(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS))) { // some usefull stuff } look at https://www.php.net/manual/en/function.debug-backtrace.php for more details on debug_backtrace function