Except this function now has some private parts accessible only by itself! Returning the block after the “return” keyword as THE function. These are important because it makes this entire function run immediately, constructing itself and then That syntax looks weird because of the parenthesis at the end.
#Dbvisualizer move results to the side code
Normal Javascript without closures (all functions are “public”)Īny code on the page can call f.getUsername() and get the username These “inner functions” can be treated like private java methods. A closure is a function specially defined inside another function. I could not really grasp “closures” until I read an article about closures that did not use the word “closure”. Closures require some “leveling up” in Javascript skill and this entire article is a must-read. Javascript does have a way for a programmer to silo their script. Think of all the second and third tier sites that will place active content on their pages for a fee. These are examples of the well known sites. Think of the ad-based attacks against the New York Times a year ago and then the attacks against Yahoo, Fox News and Google from the other day. Get around same origin policy and share information with anywhere.pull in additional scripts from anywhere.
Whoa.Ĭonsider what a third party script on your page can do: This is true most of the time and it is a huge security problem.Ī common perception from the web is that this doesn’t matter, that security “is a server-side concern”, that fears are overblown, that any restrictions on Javascript will screw up the web 2.0 “revolution”. Not only can other scripts access fields and functions of Javascript objects, alter their values, but they can replace functions themselves with functions of their own. That is, if you visit a page with included Javascript code from several sources, the code from one can, by default, call code and change code from the others. Javascript code commonly lives all together in the same namespace. This post was inspired by a recent Security Now podcast ( transcript) that featured John Graham-Cumming and reviews ways to secure Javascript by doing things like separating namespaces and working with subsets of Javascript. It wants you to put the code to time in a String and call exec on it. The included library timeit is the goofiest thing I’ve seen this year.When I encounter _main_ and if _name_ = ‘_main_’: my brain shuts down.So, the forums are filled with answers like “in 3.2, you need print (x) instead of print x” All the documentation out there is based on 2.x but they are trying to move to 3.2.
#Dbvisualizer move results to the side how to
The bit at the end is called “stride notation” (as I learned In this post about how to reverse a string). This is referred to as List Comprehension. the idiom “x*y for x in range….” and putting an if statement associated with a for statement are powerful tools. For example, for problem number 4, I came up with: When one problem is done, the forums offer great insights. Anyhow I’m amazed at how the combination of TDD and python helps me whiz through those Project Euler problems. You know what’s more awesome than spending my Saturday afternoon learning Haskell by hacking away at a few Project Euler problems? Fuck, ANYTHING.Īnd he has a point, but I watched my dad study medical journals when we were on vacation and I know that it takes time and hard work to keep up on technology. I’ve found that a fast way to learn is to use the included unittest framework in Python and use the TDD model illustrated succinctly in the Bowling Game Kata and the Prime Factors Kata. It has been pretty quick for me to learn as well, as I have to study some to stay ahead of the ten-year-old.
I’ve been teaching a ten-year-old how to program and I can say that Python is a great first language.
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