Codecademy - 12th Exercise (14 different little projects)

1.

function canIVote(age){
  if(age < 18){
    console.log("You cannot vote now.");
    return false;
  }
  else{
    console.log("You can vote, you are up to 18 years old.");
    return true;
  }
}

console.log(canIVote(19)) // Should print true




2.

function agreeOrDisagree(string1, string2){
    return string1 === string2 ? "You agree!" : "You disagree!";
}

console.log(agreeOrDisagree("yep", "yep")) // Prints "You agree!"




3.

const lifePhase = (age) => {
  if(age < 0 || age > 140){
    return "This is not a valid age";
  }
  else if(age > 0 && age <= 3){
    return "baby";
  }
  else if(age >= 4 && age <= 12){
    return "child";
  }
  else if(age >= 13 && age <= 19){
    return "teen";
  }
  else if(age >= 20 && age <= 64){
    return "adult";
  }
  else if(age >= 65 && age <= 140){
    return "senior citizen";
  }
}

console.log(lifePhase(3.5)) //should print 'child'




4.

function finalGrade(num1, num2, num3){
  if(num1 < 0 || num1 > 100 || num2 < 0 || num2 > 100 || num3 < 0 || num3 > 100){
    return "You have entered an invalid grade."
  }
  const average = (num1 + num2 + num3) / 3;
  console.log("Average: " + average);
  if(average >= 0 && average <= 59){
    return "F";
  }
  if(average >= 60 && average <= 69){
    return "D";
  }
  if(average >= 70 && average <= 79){
    return "C";
  }
  if(average >= 80 && average <= 89){
    return "B";
  }
  if(average >= 90 && average <= 100){
    return "A";
  }
}

console.log(finalGrade(99, 92, 95)) // Should print 'A'




5.

const reportingForDuty = (rank, lastName) => (rank + " " + lastName + " reporting for duty!");

console.log(reportingForDuty('Private', 'Fido')) // Should return 'Private Fido reporting for duty!'



6.

const rollTheDice = () => {
  // Math.random() gives us a random number from 0 up to, but not including, 1
  // We multiplied that by 6 to get a number between 0 and up to, but not including, 6
  // But since we actually wanted numbers from 1 to 6, inclusive, we added 1
    let die1 = Math.floor(Math.random() * 6 + 1);
    let die2 = Math.floor(Math.random() * 6 + 1);
    return die1 + die2
}



7.

function calculateWeight(earthWeight, planet){
  switch(planet){
    case "Mercury":
      return 0.378 * earthWeight;
      break;        //  Not necessary, because of return-statement above
    case "Venus":
      return 0.907 * earthWeight;
      break;        //  Not necessary, because of return-statement above
        case "Mars":
      return 0.377 * earthWeight;
      break;        //  Not necessary, because of return-statement above
    case "Jupiter":
      return 2.36 * earthWeight;
      break;        //  Not necessary, because of return-statement above
    case "Saturn":
      return 0.916 * earthWeight;break;     //  Not necessary, because of return-statement above
    default:
            return "Invalid Planet Entry. Try: Mercury, Venus, Mars, Jupiter, or Saturn.";
    }
}

console.log(calculateWeight(100, 'Jupiter')) // Should print 236




8.

const truthyOrFalsy1111 = value => {
    if (value) {
        return true
    }
    return false
}

// Write your function here:
function truthyOrFalsy(value){
  if(value === false || value === 0  || value === "" || value === '' || value === `` || value === null || value === undefined || value === NaN){
    return false;
  }
  else{
    return true;
  }
}

console.log(truthyOrFalsy(0)) // Should print false




9.

// Write your function here:
const numImaginaryFriends = (friends) => {
  return Math.round(0.33 * friends);
}

// Uncomment the line below when you're ready to try out your function
console.log(numImaginaryFriends(18)) // Should print 6



10.

const sillySentence = (adjective, verb, noun) => `I am so ${adjective} because I ${verb} coding! Time to write some more awesome ${noun}!`;

console.log(sillySentence('excited', 'love', 'functions'); );



11.

// Write your function here:
function howOld(age, year){
  if(year >= 2020){
    return `You will be ${age + year - 2019} in the year ${year}.`
  }
  else if(2019 - age > year){
    return `The year ${year} was ${2019 - age - year} years before you were born.`;
  }
  else if(2019 - age < year && year <= 2019){
    return `You were ${year - 2019 + age} in the year ${year}.`;
  }
}

console.log("This code was written in 2019 and I am born at 1999, so suppose that current year is 2019 and I was 20 years old.");
console.log();
console.log("1. " + howOld(20, 2039));
console.log("2. " + howOld(20, 2009));
console.log("3. " + howOld(20, 1909));



12.

const whatRelation = percentSharedDNA => {
    if (percentSharedDNA === 100) {
        return 'You are likely identical twins.'
    }
    else if (percentSharedDNA <= 99 && percentSharedDNA > 34) {
        return 'You are likely parent and child or full siblings.'
    }
    else if (percentSharedDNA <= 34 && percentSharedDNA > 13) {
        return 'You are likely grandparent and grandchild, aunt/uncle and niece/nephew, or half siblings.'
    }
    else if (percentSharedDNA > 5 && percentSharedDNA <=13) {
        return 'You are likely 1st cousins.'
    }
    else if (percentSharedDNA > 2 && percentSharedDNA <= 5) {
        return 'You are likely 2nd cousins.'
    }
    else if (percentSharedDNA > 0 && percentSharedDNA <= 2) {
        return 'You are likely 3rd cousins'
    }
    return 'You are likely not related.'
}

console.log(whatRelation(34))
// Should print 'You are likely grandparent and grandchild, aunt/uncle and niece/nephew, or half siblings.'

console.log(whatRelation(3))
// Should print 'You are likely 2nd cousins.'




13.

// Write your function here:
const tipCalculator = (quality, total) => {
  switch(quality){
    case "bad":
      return 0.05 * total;
      break;
    case "ok":
        return 0.15 * total;
      break;
    case "good":
        return 0.2 * total;
      break;
    case "excellent":
      return 0.3 * total;
      break;
    default:
      return 0.18 * total;
      break;
  }
}

console.log(tipCalculator('good', 100)) //should return 20



14.

// Write your function here:
function toEmoticon(emotion){
  switch(emotion){
    case "shrug":
      return '|_{"}_|';
        break;
    case "smiley face":
      return ':)';
            break;
        case "frowny face":
      return ':(';
            break;
        case "winky face":
      return ';)';
            break;
        case "heart":
      return '<3';
            break;
        default:
            return "|_(* ~ *)_|";
            break;
  }
}

// console.log(toEmoticon("whatever"))
// Should print  '|_(* ~ *)_|'