keyvanakbary

; Let lambda syntactic sugar
(let [var1 exp1
      var2 exp2]
    (do-something var1 var2))

((fn [var1 var2]
     (do-something var1 var2))
(exp1 exp2))

jashkenas

var http  = require('http');
var fs    = require('fs');
var _     = require('underscore');

var items = {
  "Headline 1": "Link1 Link2 Link3 Link4 Link5 Link6 Link7".split(' '),
  "Headline 2": "Link1 Link2 Link3 Link4 Link5 Link6 Link7".split(' '),
  "Headline 3": "Link1 Link2 Link3 Link4 Link5 Link6 Link7".split(' '),
  "Headline 4": "Link1 Link2 Link3 Link4 Link5 Link6 Link7".split(' ')
};

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs