command | description |
---|---|
ctrl + a | Goto BEGINNING of command line |
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" lambda λ | |
imap <C-j> <C-k>l* | |
" right arrow → | |
imap <C-l> <C-k>-> | |
" left arrow ← | |
imap <C-h> <C-k><- | |
" compose ∘ |
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const Task = require('data.task') | |
Task.prototype.alt = function (that) { | |
return new Task((rej, res) => | |
this.fork(_ => that.fork(rej, res), res)) | |
} | |
const hosts = [ | |
[ 'db1.mysite.com', 'user', 'password' ], | |
[ 'db2.mysite.com', 'user', 'password' ], |
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const I = x => x; | |
const K = x => y => x; | |
const A = f => x => f(x); | |
const T = x => f => f(x); | |
const W = f => x => f(x)(x); | |
const C = f => y => x => f(x)(y); | |
const B = f => g => x => f(g(x)); | |
const S = f => g => x => f(x)(g(x)); | |
const P = f => g => x => y => f(g(x))(g(y)); | |
const Y = f => (g => g(g))(g => f(x => g(g)(x))); |
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/** | |
* This short program will encrypt the user password | |
* and insert a new record into a mock database. | |
*/ | |
const Reader = require('fantasy-readers'); | |
const R = require('ramda'); | |
const crypto = require('crypto'); | |
// our mock database | |
const database = [ |
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// Requires traceur | |
import { iterate, take, map, foldl } from './list-out-of-yield'; | |
// Sum of squares of integers 1..100 | |
var values = take(100, iterate(x => x + 1, 1)); | |
var result = foldl((x, y) => x + y, 0, map(x => x * x, values)); | |
console.log(result); |
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Below are the Big O performance of common functions of different Java Collections. | |
List | Add | Remove | Get | Contains | Next | Data Structure | |
---------------------|------|--------|------|----------|------|--------------- | |
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array | |
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List | |
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array |
GitHub only lets you fork a repo once, if you want to make more than one copy of a project here's how you can do it. Useful for starter code.
-
Create a new empty folder for your project and initialize git
cd where-you-keep-your-projects
mkdir your-project-name