DataCamp Creating variables Sample Solution

# Create company_1

company_1 = 'Apple'

print(company_1)


# Create year_1

year_1 = 2017

print(year_1)


# Create revenue_1

revenue_1 = 229.23

print(revenue_1)

FreeCodeCamp Wherefore Art Thou Sample Solution

function whatIsInAName(collection, source) {
  // What's in a name?
  var arr = [];
  // Only change code below this line
  //return Object.keys(source);
 
  var sourceKeys = Object.keys(source);
  var sourceValues = Object.values(source);
 
  for(var i=0; i<collection.length; i++){
    var collectionKeys = Object.keys(collection[i]);
    var collectionValues = Object.values(collection[i]);
   
    var allKeysTrue = true;
    var allValuesTrue = true;
    for(var j=0; j<sourceKeys.length; j++){
     
      if(!collectionKeys.toString().includes(sourceKeys[j].toString())){
        allKeysTrue = false;
      }
     
      if(!collectionValues.toString().includes(sourceValues[j].toString())){
        allValuesTrue = false;
      }
     
    }
    if(allKeysTrue && allValuesTrue){
      arr.push(collection[i]);
    }
  }
  // Only change code above this line
  return arr;
}

whatIsInAName([{ first: "Romeo", last: "Montague" }, { first: "Mercutio", last: null }, { first: "Tybalt", last: "Capulet" }], { last: "Capulet" });

FreeCodeCamp Everything Be True Sample Solution

function truthCheck(collection, pre) {
  // Is everyone being true?
  var test = true;
  for(var i=0; i<collection.length; i++){
    if(pre in collection[i]){
      if(!collection[i][pre]){
        test = false;
        break;
      }
    } else {
      test = false;
      break;
    }
  }
  return test;
}

truthCheck([{"user": "Tinky-Winky", "sex": "male", "age": 0}, {"user": "Dipsy", "sex": "male", "age": 3}, {"user": "Laa-Laa", "sex": "female", "age": 5}, {"user": "Po", "sex": "female", "age": 4}], "age");

FreeCodeCamp Binary Agents Sample Solution

function binaryAgent(str) {
  var arr = str.split(" ");
  var arr2 = [];
  for(var i=0; i<arr.length; i++){
    arr2.push(String.fromCharCode(parseInt(arr[i], 2)));
  }
  return arr2.join("");
}

binaryAgent("01000001 01110010 01100101 01101110 00100111 01110100 00100000 01100010 01101111 01101110 01100110 01101001 01110010 01100101 01110011 00100000 01100110 01110101 01101110 00100001 00111111");

FreeCodeCamp Steamroller Sample Solution

function steamrollArray(arr) {
  // I'm a steamroller, baby
  var flattened = arr.reduce(
    function(a, b) {
      return a.concat(Array.isArray(b) ? steamrollArray(b) : b);
    },[]);
  return flattened;
}

steamrollArray([[["a"]], [["b"]]]);

FreeCodeCamp Drop It Sample Solution

function dropElements(arr, func) {
  // Drop them elements.
  for(var i=0; i<arr.length; i++){
    if([arr[i]].filter(func)>0){
      return arr.slice(i,arr.length);
    }
  }
  return [];
}

dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;});

FreeCodeCamp Finders Keepers Sample Solution

function findElement(arr, func) {
  var filtered = arr.filter(func);
  return filtered[0];
}

findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; });

FreeCodeCamp Sum All Primes Sample Solution

function isPrime(value) {
  for(var i = 2; i < value; i++) {
    if(value % i === 0) {
      return false;
    }
  }
  return true;
}

function genPrimeArr(num){
  var arr = [];
  for(var i=2; i<=num; i++){
   
    if(isPrime(i)){
      arr.push(i);
    }
  }
  return arr;
}

function sumArr(arr){
  var sum = 0;
  for(var i=0; i<arr.length; i++){
    sum += arr[i];
  }
  return sum;
}

function sumPrimes(num) {
  return sumArr(genPrimeArr(num));
}

sumPrimes(10);

FreeCodeCamp Sum All Odd Fibonacci Numbers Sample Solution

function generateFibSeq(num){
  var arr=[1,1];
  while(num > arr[arr.length-1]){
    if(arr[arr.length-1]+arr[arr.length-2] > num){
      break;
    }
    arr.push(arr[arr.length-1]+arr[arr.length-2]);
  }
  return arr;
}

function sumFibs(num) {
  if(num===1){
    return 1;
  }
  var fibArr = generateFibSeq(num);
 
  var sum = 0;
  for(var i in fibArr){
    if(fibArr[i]%2 !== 0){
      sum += fibArr[i];
    }
  }
  return sum;
}

sumFibs(75025);

FreeCodeCamp Spinal Tap Case Sample Solution

function spinalCase(str) {
  var str2 = str.replace(/([a-z](?=[A-Z]))/g,'$1 ');
  var newStr = str2.replace(/\s|\x5F/g,"-");
  return newStr.toLowerCase();
}

spinalCase("AllThe-small Things");

FreeCodeCamp Convert HTML Entities Sample Solution

function convertHTML(str) {
  // &colon;&rpar;
  var htmlCode = {
    "&":"&amp;",
    "<":"&lt;",
    ">":"&gt;",
    "\"":"&quot;",
    "'":"&apos;"
  };
  var arrayStr = str.split('');
  for(var i in arrayStr){
    for(var j in htmlCode){
      if(arrayStr[i] == j){
        arrayStr[i] = htmlCode[j];
      }
    }
  }
  return arrayStr.join('');
}

convertHTML("Dolce & Gabbana");

FreeCodeCamp Sorted Union Sample Solution

function uniteUnique(arr) {
  var args = Array.prototype.slice.call(arguments);
  var newArr = [];
 
  for(var i=0; i<args.length; i++){
    for(var j=0; j<args[i].length; j++){
      newArr.push(args[i][j]);
    }
  }
 
  var uniqueArray = newArr.filter(function(item, pos) {
    return newArr.indexOf(item) == pos;
  });
 
  return uniqueArray;
}

uniteUnique([1, 3, 2], [5, 2, 1, 4], [2, 1]);

FreeCodeCamp Missing Letters Sample Solution

function fearNotLetter(str) {
  var arr = str.split('');
  var codes = [];
  for(var i=0; i<arr.length; i++){
    codes.push(arr[i].charCodeAt(0));
  }
 
  for(var j=0; j<codes.length; j++){
    if(codes[j] != codes[0]+j){
      return String.fromCharCode(codes[0]+j);
    }
  }
  return undefined;
}

fearNotLetter("abce");

FreeCodeCamp DNA Pairing Sample Solution

function pairElement(str) {
  var pairs = {
    'G':'C',
    'C':'G',
    'A':'T',
    'T':'A'
  };
  var arr = str.split("");
  var arrPairs = [];
  for(var i=0; i<arr.length; i++){
    arrPairs.push([arr[i],pairs[arr[i]]]);
  }
  return arrPairs;
}

pairElement("GCG");

FreeCodeCamp Pig Latin Sample Solution

function vowelCheck(str,index){
  if(str[index]=='a' || str[index]=='e' || str[index]=='i' || str[index]=='o' || str[index]=='u'){
    return true;
  }
}

function translatePigLatin(str) {
  //vowel case
  str = str.toLowerCase();
  var arr = [];
  var indexCount = 0;
  if(vowelCheck(str,0)){
    return str+"way";
  } else {
    arr.push(str[0]);
    indexCount++;
    for(var i=1; i<str.length; i++){
      if(!vowelCheck(str,i)){
        arr.push(str[i]);
        indexCount++;
      } else {
        break;
      }
    }
    return str.substr(indexCount,str.length)+arr.join('')+"ay";
  }
  return arr;
}

translatePigLatin("consonant");

FreeCodeCamp Search and Replace Sample Solution

function myReplace(str, before, after) {
  var test = '/'+ before +'/';
  //return after;
  if(before[0] == before[0].toUpperCase()){
    var firstLetter = after.split('').splice(0,1);
    var restOfTheWord = after.split('').splice(1,after.length).join('');
    after = firstLetter[0].toUpperCase()+restOfTheWord;
  }
  var newstr = str.split(before).join(after);
  return newstr;
}

myReplace("He is Sleeping on the couch", "Sleeping", "sitting");

FreeCodeCamp Roman Numeral Converter Sample Solution

function convertToRoman(num) {
 var chart = {
   0:'',
   1:'I',
   2:'II',
   3:'III',
   4:'IV',
   5:'V',
   6:'VI',
   7:'VII',
   8:'VIII',
   9:'IX',
   10:'X',
   20:'XX',
   30:'XXX',
   40:'XL',
   50:'L',
   60:'LX',
   70:'LXX',
   80:'LXXX',
   90:'XC',
   100:'C',
   200:'CC',
   300:'CCC',
   400:'CD',
   500:'D',
   600:'DC',
   700:'DCC',
   800:'DCCC',
   900:'CM',
   1000:'M',
   2000:'MM',
   3000:'MMM'
 };
 var numString = num.toString().split('');
 if(numString.length == 1){
   return chart[parseInt(numString[0])];
 } else if(numString.length == 2){
   return chart[parseInt(numString[0])*10]+chart[parseInt(numString[1])];
 } else if(numString.length == 3){
   return chart[parseInt(numString[0])*100]+
     chart[parseInt(numString[1])*10]+
     chart[parseInt(numString[2])];
 } else if(numString.length == 4){
   return chart[parseInt(numString[0])*1000]+
     chart[parseInt(numString[1])*100]+
     chart[parseInt(numString[2])*10]+
     chart[parseInt(numString[3])];
 }
}
convertToRoman(2);

FreeCodeCamp Diff Two Arrays Sample Solution

function cleanArray(actual) {
  var newArray = [];
  for (var i = 0; i < actual.length; i++) {
    if (actual[i]) {
      newArray.push(actual[i]);
    }
  }
  return newArray;
}

function diffArray(arr1, arr2) {
  var newArr = [];
  // Same, same; but different.
  var slicedArr1;
  var slicedArr2;
  for(var i=0; i<arr1.length; i++){
    for(var j=0; j<arr2.length; j++){
      if(arr1[i] === arr2[j]){
        //arr1.splice(i,1);
        delete arr1[i];
        //arr2.splice(j,1);
        delete arr2[j];
      }
    }  
  }
  newArr = arr1.concat(arr2);
  return cleanArray(newArr);
}

diffArray(["diorite", "andesite", "grass", "dirt", "pink wool", "dead shrub"], ["diorite", "andesite", "grass", "dirt", "dead shrub"]);

FreeCodeCamp Sum All Numbers In Range Sample Solution

function sumAll(arr) {
  var sorted = arr.sort(function(a, b){return a-b});
  var sum = 0;
  for(var i=sorted[0]; i<=sorted[1]; i++){
    sum += i;
  }
  return sum;
}

sumAll([1, 4]);

FreeCodeCamp Caesars Cipher Sample Solution

function rot13(str) {
  var num = [];
  for(var i=0; i<str.length; i++){
    num.push(str.charCodeAt(i));
  }
 
  var num2 = num.map( function(value) {
    //A to Z is between 65 and 90 so only convert these values
    if(value>=65 && value<=90){
      if(value-13 >= 65){
        return value - 13;
      } else {
        return value + 13;
      }
    } else {
      return value;
    }
  });
 
  var num3 = [];
  for(var j=0; j<num2.length; j++){
    num3.push(String.fromCharCode(num2[j]));
  }
 
  return num3.join('');
}