| function slugify(text) | |
| { | |
| return text.toString().toLowerCase() | |
| .replace(/\s+/g, '-') // Replace spaces with - | |
| .replace(/[^\w\-]+/g, '') // Remove all non-word chars | |
| .replace(/\-\-+/g, '-') // Replace multiple - with single - | |
| .replace(/^-+/, '') // Trim - from start of text | |
| .replace(/-+$/, ''); // Trim - from end of text | |
| } |
| Latency Comparison Numbers (~2012) | |
| ---------------------------------- | |
| L1 cache reference 0.5 ns | |
| Branch mispredict 5 ns | |
| L2 cache reference 7 ns 14x L1 cache | |
| Mutex lock/unlock 25 ns | |
| Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
| Compress 1K bytes with Zippy 3,000 ns 3 us | |
| Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
| Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
| import boto | |
| import sys | |
| ec2 = boto.connect_ec2() | |
| elb = boto.connect_elb() | |
| load_balancer = elb.get_all_load_balancers(load_balancer_names=[sys.argv[1]])[0] | |
| health = load_balancer.get_instance_health() | |
| instances = ec2.get_only_instances(instance_ids=[instance.id for instance in load_balancer.instances]) |
Below are many examples of function hoisting behavior in JavaScript. Ones marked as works successfuly print 'hi!' without errors.
To play around with these examples (recommended) clone them with git and execute them with e.g. node a.js
(I may be using incorrect terms below, please forgive me)
The standard way of understanding the HTTP protocol is via the request reply pattern. Each HTTP transaction consists of a finitely bounded HTTP request and a finitely bounded HTTP response.
However it's also possible for both parts of an HTTP 1.1 transaction to stream their possibly infinitely bounded data. The advantages is that the sender can send data that is beyond the sender's memory limit, and the receiver can act on
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All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
| # Sample Nginx config with sane caching settings for modern web development | |
| # | |
| # Motivation: | |
| # Modern web development often happens with developer tools open, e. g. the Chrome Dev Tools. | |
| # These tools automatically deactivate all sorts of caching for you, so you always have a fresh | |
| # and juicy version of your assets available. | |
| # At some point, however, you want to show your work to testers, your boss or your client. | |
| # After you implemented and deployed their feedback, they reload the testing page – and report | |
| # the exact same issues as before! What happened? Of course, they did not have developer tools | |
| # open, and of course, they did not empty their caches before navigating to your site. |
This gist will drive you through creating a Docker 1.12 Swarm cluster (with Swarm mode) on AWS infrastructure.
You need a few things already prepared in order to get started. You need at least Docker 1.12 set up. I was using the stable version of Docker for mac for preparing this guide.
$ docker --version
Docker version 1.12.0, build 8eab29e
You also need Docker machine installed.