filteringBooleans.js

// Object.values().filter(Boolean)
// -------------------------------
// Video: https://courses.wesbos.com/account/access/5f69bb13ebaa134ef228e80e/view/455624835
// Filter undefinded toppings out
const tops = Object.values(toppings).filter(topping => topping !== undefined)

// can also be written as:
const tops = Object.values(toppings).filter(Boolean)
// e.g Boolean(undefined) => will return false
// e.g Boolean(0) => will return false
// e.g Boolean('') => will return false
// e.g Boolean(' ') => will return true (check this)


// Array.filter(Boolean)
// -------------------------------
// http://www.devign.me/javascript-tip-remove-falsy-items-out-of-an-array
// A quick tip to remove all falsy (false, null, undefined, 0, NaN or an empty string) items out of an array:
var a=[1, 2, "b", 0, {}, "", NaN, 3, undefined, null, 5];
var b=a.filter(Boolean); // [1,2,"b",{},3,5]