[CodeAcademy] 기본 문법, 변수 선언, 조건문

// [1] 기본 콘솔 출력 방법, 자료구조, 기본 연산 문법 (Intorduction to JavaScript)

console.log(5)
console.log(50)

// Opening line.
console.log('It was love at first sight.');
/*
console.log('The first time Yossarian saw the chaplain he fell madly in love with him.');
console.log('Yossarian was in the hospital with a pain in his liver that fell just short of being jaundice.');
console.log('The doctors were puzzled by the fact that it wasn\'t quite jaundice.');
console.log('If it became jaundice they could treat it.');
console.log('If it didn\'t become jaundice and went away they could discharge him.');
console.log('But this just being short of jaundice all the time confused them.');
*/

console.log('JavaScript')
console.log(2011)
console.log('Woohoo! I love to code! #codecademy')
console.log(20.49)

console.log(1+3.5)
console.log(2026-1969)
console.log(65/240)
console.log(0.2708* 100)

console.log('Hello'+'World')
console.log('Hello '+'World')

console.log('Teaching the world how to code'.length)

// Use .toUpperCase() to log 'Codecademy' in all uppercase letters
console.log('Codecademy'.toUpperCase());

// Use a string method to log the following string without whitespace at the beginning and end of it.
console.log('    Remove whitespace   '.trim());

console.log(
  Math.floor(Math.random()*100)
  )

console.log(
  Math.ceil(43.8)
  )  

console.log(
  Number.isInteger(2017)
)



// [2] 변수 선언, 유형, 조작

var favoriteFood = 'pizza'
var numOfSlices = 8
console.log(
  favoriteFood, numOfSlices
)

let changeMe = true
console.log(changeMe)
changeMe = false
console.log(changeMe)

const entree = 'Enchiladas'
console.log(
  entree
)

entree = 'Tacos'


let levelUp = 10;
let powerLevel = 9001;
let multiplyMe = 32;
let quarterMe = 1152;

// Use the mathematical assignments in the space below:


levelUp += 5
powerLevel -= 100
multiplyMe *= 11
quarterMe /= 4



// These console.log() statements below will help you check the values of the variables.
// You do not need to edit these statements. 
console.log('The value of levelUp:', levelUp); 
console.log('The value of powerLevel:', powerLevel); 
console.log('The value of multiplyMe:', multiplyMe); 
console.log('The value of quarterMe:', quarterMe);

let gainedDollar = 3;
let lostDollar = 50;

gainedDollar++;
lostDollar --;

let favoriteAnimal = 'dog';
console.log(
  'My favorite animal: ' + favoriteAnimal
);

const myName = 'ssw';
const myCity = 'Texas';
console.log(
    `My name is ${myName}. My favorite city is ${myCity}.`
)

let newVariable = 'Playing around with typeof.';

console.log(
  typeof newVariable
)

newVariable = 1

console.log(
  typeof newVariable
)




// free mini pratice1: Kelvin Weather

// kelvin temperature
const kelvin = 0;
// transforming kelvin into celsius
let celsius = kelvin - 273;
// fqhrenheit
let fahrenheit = celsius * (9/5) + 32;
// round value
fahrenheit = Math.floor(fahrenheit);

console.log(
  `The temperature is ${fahrenheit} degrees Fahrenheit.`
);

let Newton = celsius * 33/100

console.log(
  `The temperature is ${Newton} degrees Newton.`
);


// free mini practice2: Dog Years
// myage
const myname = 'ssw'
let myAge = 33;
// 
let earlyYears = 2;
earlyYears *= 10.5;

//
let laterYears = myAge - 2;
laterYears *= 4;

console.log(
  earlyYears, laterYears
);

let myAgeInDogYears = earlyYears + laterYears
console.log(
  `My name is ${myname}. I am ${myAge} years old in human years, which is ${myAgeInDogYears} old in dog years.`
);




// [3] 조건문, 불리언 개념, 스위치

let sale = true;

sale = false;

if (sale) {
  console.log('Time to buy!');
} else {
  console.log('Time to wait for a sale.');
}

let hungerLevel = 7

if (hungerLevel > 7 ) {
  console.log('Time to eat!')
} else {
  console.log('We can eat later!')
}


let mood = 'sleepy';
let tirednessLevel = 6;

if (mood === 'sleepy' && tirednessLevel > 8) {
  console.log('time to sleep');
} else {
  console.log('not bedtime yet');
}

let wordCount = 1;

if (wordCount) {
  console.log("Great! You've started your work!");
} else {
  console.log('Better get to work!');
}


// let favoritePhrase = '';

// if (favoritePhrase) {
//   console.log("This string doesn't seem to be empty.");
// } else {
//   console.log('This string is definitely empty.');
// }

let tool = 'marker';

// Use short-circuit evaluation to assign  writingUtensil variable below:
let writingUtensil = tool || 'pen'

console.log(`The ${writingUtensil} is mightier than the sword.`);


let isLocked = false;

isLocked? console.log('You will need a key to open the door.')
: console.log('You will not need a key to open the door.');

let isCorrect = true;

isCorrect? console.log('Correct!')
:console.log('Incorrect!');

let favoritePhrase = 'Love That!';

favoritePhrase === 'Love That!'? console.log('I love that!')
:console.log("I don't love that!");


let season = 'summer';

if (season === 'spring') {
  console.log('It\'s spring! The trees are budding!');
} else if (season === 'winter') {
  console.log('It\'s winter! Everything is covered in snow.');
} else if (season === 'fall') {
  console.log('It\'s fall! Leaves are falling!');
} else if (season === 'summer') {
  console.log('It\'s sunny and warm because it\'s summer!');
} else {
  console.log('Invalid season.');
}

let athleteFinalPosition = 'first place';
switch (athleteFinalPosition) {
  case 'first place':
  console.log('You get the gold medal!');
  break;
  case 'second place':
  console.log('You get the silver medal!');
  break;
  case 'third place':
  console.log('You get the bronze medal!');
  break;
  default:
  console.log('No medal awarded.');
  break;
}