Dr. Derek Austin DoctorDerek

## Set-array-one-liner.js
Array.from(new Set([37, 37, 3700, 3700])) // [37,3700]

## use-Set-for-unique-object-references-in-an-array.js
// Different JavaScript objects have different
// object references, even with the same values:
const someArray = [1]
const otherArray = [1]

// Different references even though both are [1]
console.log(`Does someArray === someArray?`)
console.log(`${someArray === someArray}`)
// Output: true because of same object reference
console.log(`Does someArray === otherArray?`)

## use-Set-array-spread-operator-one-liner.js
[...new Set([3, 4, 5, 5])] // [3,4,5]

## methods-to-iterate-through-a-set.js
const emojiSet = new Set(["🙋🏼", "🦾", "🦿", "🙋🏼"])

//  Use Set.prototype.keys() or Set.prototype.values()
const emojiIterator = emojiSet.values()
// You can use a for...of loop with an Iterator object
for (const emoji of emojiIterator) {
  console.log(emoji)
}
// emojiSet.keys() is equivalent to: emojiSet.values()
for (const emoji of emojiSet.keys()) {

## Using Set with an Array of Objects to Find Unique Values.js
const yearsArray = [{ year: 1999 }, { year: 2000 }, { year: 1999 }]
const arrayOfOnlyYears = yearsArray.map((object) => object.year)
const uniqueYears = [...new Set(arrayOfOnlyYears)]
console.log(uniqueYears) // [1999,2000]

## use-Set-with-an-array-for-unique-primitives.js
// Set up a number array with duplicate values
const myNumberArray = [37, 37, 370, 3700, 3700, 37]

// Using Set with different approaches
// 1) Set using for...of loop
const myNumberSetForOf = new Set()
for (const myNumber of myNumberArray) {
  myNumberSetForOf.add(myNumber)
}
// 2) Set using .forEach()

## finding-unique-object-keys-or-values-with-set.js
// You can use Object.values() with Set to find unique
// values in an object, but keys are always unique.
const myObject = { hello: "🌏", hi: "🌏", howdy: "🚯" }

console.log(new Set(Object.keys(myObject)))
// Output: Set(3) [ "hello", "hi", "howdy" ]
console.log(new Set(Object.values(myObject)))
// Output: Set(2) [ "🌏", "🚯" ]
console.log(new Set(Object.entries(myObject)))
// Output: Set(3) [[ "hello", "🌏" ], ...]

## .gitignore
# Markdown files managed by DatoCMS
src/pages/

# Secret API keys for Auth0 testing locally
.env.development

## gatsby-config.js
    },
    {
      resolve: `gatsby-theme-auth0`,
      options: {
        domain: process.env.AUTH0_DOMAIN,
        clientID: process.env.AUTH0_CLIENT_ID,
        redirectUri: process.env.AUTH0_CALLBACK_URL,
        // Optional fields:
        // audience: process.env.AUTH0_AUDIENCE,
        // responseType: process.env.AUTH0_RESPONSE_TYPE,

## gatsy-config.js
require("dotenv").config({
  path: `.env.${process.env.NODE_ENV}`,
})
	// Different JavaScript objects have different
	// object references, even with the same values:
	const someArray = [1]
	const otherArray = [1]

	// Different references even though both are [1]
	console.log(`Does someArray === someArray?`)
	console.log(`${someArray === someArray}`)
	// Output: true because of same object reference
	console.log(`Does someArray === otherArray?`)
	const emojiSet = new Set(["🙋🏼", "🦾", "🦿", "🙋🏼"])

	// Use Set.prototype.keys() or Set.prototype.values()
	const emojiIterator = emojiSet.values()
	// You can use a for...of loop with an Iterator object
	for (const emoji of emojiIterator) {
	console.log(emoji)
	}
	// emojiSet.keys() is equivalent to: emojiSet.values()
	for (const emoji of emojiSet.keys()) {
	const yearsArray = [{ year: 1999 }, { year: 2000 }, { year: 1999 }]
	const arrayOfOnlyYears = yearsArray.map((object) => object.year)
	const uniqueYears = [...new Set(arrayOfOnlyYears)]
	console.log(uniqueYears) // [1999,2000]
	// Set up a number array with duplicate values
	const myNumberArray = [37, 37, 370, 3700, 3700, 37]

	// Using Set with different approaches
	// 1) Set using for...of loop
	const myNumberSetForOf = new Set()
	for (const myNumber of myNumberArray) {
	myNumberSetForOf.add(myNumber)
	}
	// 2) Set using .forEach()
	// You can use Object.values() with Set to find unique
	// values in an object, but keys are always unique.
	const myObject = { hello: "🌏", hi: "🌏", howdy: "🚯" }

	console.log(new Set(Object.keys(myObject)))
	// Output: Set(3) [ "hello", "hi", "howdy" ]
	console.log(new Set(Object.values(myObject)))
	// Output: Set(2) [ "🌏", "🚯" ]
	console.log(new Set(Object.entries(myObject)))
	// Output: Set(3) [[ "hello", "🌏" ], ...]
	# Markdown files managed by DatoCMS
	src/pages/

	# Secret API keys for Auth0 testing locally
	.env.development
	},
	{
	resolve: `gatsby-theme-auth0`,
	options: {
	domain: process.env.AUTH0_DOMAIN,
	clientID: process.env.AUTH0_CLIENT_ID,
	redirectUri: process.env.AUTH0_CALLBACK_URL,
	// Optional fields:
	// audience: process.env.AUTH0_AUDIENCE,
	// responseType: process.env.AUTH0_RESPONSE_TYPE,
	require("dotenv").config({
	path: `.env.${process.env.NODE_ENV}`,
	})