dnasca

var a = (...n) => {
  console.log(n[1])
};

a([1,2,3],[3,4,5],[6,7,8]) // -> [3,4,5]

dnasca

//when function scope sucks, and you have to cache 'this'
let a = function() {
  let that = this;
  this.val = 1;
  setTimeout(function() {
    that.val++;
    console.log(that.val)
  }, 1)
};

dnasca

// pure function
// evaluates the same result given the same args
// doesn't depend on and doesn't modify the states of variables outside it's scope
// no side effects (mutations, async reqs)

var foods = ['beans', 'rice', 'pizza', 'pineapple']

// slice (shallow modified copy of array) vs splice (modifies original array)

foods.slice(0,3) //returns ['beans', 'rice', 'pizza']

dnasca

<Helmet
  meta={ [
    {
      name: "generator", content: `${
      process.env.PHENOMIC_NAME } ${ process.env.PHENOMIC_VERSION }`,
    },
    { property: "og:site_name", content: pkg.name },
    { name: "twitter:site", content: `@${ pkg.twitter }` },
  ] }
  script={ [

dnasca

const createStore = (reducer) => {
  let state;
  let listeners = [];
  
  const getState = () => state;
  
  const dispatch = (action) => {
    state = reducer(state, action);
    listeners.forEach(listener => listener());
  };

dnasca

class Animal {
  constructor(race) {
    this.race = race;
  }
}

class Cat extends Animal {
  constructor(race) {
    super(race);
  }

dnasca

{
	"always_show_minimap_viewport": true,
	"args":
	{
		"name": "Packages/Babel Snippets/react_wrap.sublime-snippet"
	},
	"bold_folder_labels": true,
	"color_scheme": "Packages/User/SublimeLinter/Material-Theme-OceanicNext (SL).tmTheme",
	"command": "insert_snippet",
	"detect_indentation": false,

dnasca

:first-child               i === 0
:last-child                i === arr.length - 1

:only-child                arr.length === 1

:nth-child(even)           i % 2
:nth-child(odd)            !(i % 2)

:nth-child(n)              i === n - 1
:nth-last-child(n)         i === arr.length - n

dnasca

--multiple CTEs per statement

WITH
  ProductQty AS (
  	SELECT 
  		ProductId, 
  		LocationId, 
  		Shelf, 
  		Bin, 
  		Quantity

dnasca

WITH 
  ProductQty (PID, LID, Shelf, Bin, Qty) AS
  (SELECT 
    ProductId, LocationId, Shelf, Bin, Quantity
  FROM
    Production.ProductInventory)
  
SELECT 
  p1.PID,
  SUM(p1.Qty) AS ShelfQty_A,