| 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 |
| /* Client side, works in Chrome 55 and Firefox 52 without transpilation */ | |
| //https://blogs.msdn.microsoft.com/typescript/2016/11/08/typescript-2-1-rc-better-inference-async-functions-and-more/ | |
| async function fetchURLs() { | |
| try { | |
| // Promise.all() lets us coalesce multiple promises into a single super-promise | |
| var data = await Promise.all([ | |
| /* Alternatively store each in an array */ | |
| // var [x, y, z] = await Promise.all([ | |
| // parse results as json; fetch data response has several reader methods available: | |
| //.arrayBuffer() |
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)
| var a,b=0,c=10,qwer ="TFy!QJu ROo TNn(ROo)SLq SLq ULo+UHs UJq TNn*RPn/QPbEWS_JSWQAIJO^NBELPeHBFHT}TnALVlBLOFAkHFOuFETpHCStHAUFAgcEAelclcn^r^r\\tZvYxXyT|S~Pn SPm SOn TNn ULo0ULo#ULo-WHq!WFs XDt!"; | |
| while ((a = qwer.charCodeAt(b++)) != 0) { | |
| while (a-- > 64) { | |
| require('sys').print( ++c==90 ? String.fromCharCode(c = c/ 9):String.fromCharCode(33^b&1)); | |
| } | |
| } | |
| //Source : http://codepad.org/ngiITeZ4 |
| var express = require('express') | |
| , app = express() | |
| , fs = require('fs'); | |
| // Routes | |
| app.get('/form', function(req, res) | |
| { | |
| fs.readFile('./form.html', function(error, content) | |
| { |
