Home_training_22112021

home practice 22.11.2021

// showing object info 
 let dog = {
    name: 'Ronnie',
     breed: 'chihuahua',
     weight: 2.1,
     color: 'white-red',
     age: 5
 };
for(let feature in dog) {
    let info = feature + dog[feature];
}


//iterate array until 0 found
let nums = [6, -54, 0, 33, -5];

for(let i = 0; i < nums.length; i++) {
    if(nums[i] !== 0) {
        console.log(nums[i])
    } else {
        break
    }
}


//show summary from all positive numbers from array
let nums = [6, -54, 4, 33, -5];

let sumNums = 0;
 for(let i = 0; i < nums.length; i++) {
     if(nums[i] >= 0) {
         sumNums += nums[i]
     } else {
         break
     }
 }
 
 
 //show string like this '-1-2-3-4-5-6-'
 let nums = [1, 2, 3, 4, 5, 6];

 let count = '-';
 for(let i = 1; i < 10; i++) {
     count += i + '-'
 }
 console.log(count);
 
 
 //show 11 12 13 21 22 23 31 32 33 in console
  for(let i = 1; i < 4; i++) {
     for(let j = 1; j < 4 ; j++) {
          console.log(i, j)
     }
 };
 
 
 //make all numbers multiplied with itselves
 let nums = [6, -54, 4, 33, -5];

for(let i = 0; i < nums.length; i++) {
    console.log(Math.pow(nums[i], 2));
}


//fill an empty array with numbers from 1 to 10
 const arrToPush = [];

 for(let i = 1; i < 11; i++) {
     arrToPush.push(i)
 }
 console.log(arrToPush);
 
 
 //modify previous array to look like from 10 to 1
  console.log(arrToPush.reverse());
  
  
  //fill the object with info from one array and the object values from another array
   let days = ['monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'];
 let week = {};
 let arr = [1, 2, 3, 4, 5, 6, 7];

 for(let i = 0; i < 8; i++) {
    week[days[i]] = arr[i];
 }
 console.log(week);
 
 
 //fill the object with keys and values where values are between 10 and 20
  let obj = {'a': 12, 'b': 21, 'c': 13, 'd': 23, 'e': 17};
 let newObj = {};

 for(let key in obj) {
     if(obj[key] > 10 && obj[key] < 20) {
         newObj[[key]] = obj[key]
     }
 }
  console.log(newObj);
 
 
 //fill and object with info from two arrays
  let cloth = ['blouse', 'socks', 'shorts', 't-shirt', 'jacket'];
 let colors = ['green', 'white', 'yellow', 'red', 'black'];
 let order = {};
    for(let i = 0; i < cloth.length; i++) {
        order[cloth[i]] = colors[i]
    }
 console.log(order)
 
 
 //multiple twice every value from the object
  let obj = {'a': 1, 'b': 2, 'c': 3,
     'd': 4, 'e': 5};

    for(let key in obj) {
        obj[key] = Math.pow(obj[key], 2)
    }
 console.log(obj);
 
 
 //modify previous object swapping keys and values
   let obj = {'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5};
     
   let newObj = {};

    for(let key in obj) {
        newObj[obj[key]] = key;
    }
console.log(newObj)


//increase values by 10%
let salaries = {
    employee1: 100,
    employee2: 200,
    employee3: 300,
    employee4: 400,
    employee5: 500,
    employee6: 600,
    employee7: 700,
};

for(let key in salaries) {
    if(salaries[key] >= 400) {
        salaries[key] += salaries[key] * 0.1
    }
}
console.log(salaries);


//fill the object from two arrays
let arr1 = [1, 2, 3, 4, 5];
let arr2 = [6, 7, 8, 9, 10];

let numObj = {};

for(let i = 0; i < arr1.length; i++) {
    numObj[arr1[i]] = arr2[i]
}

console.log(numObj);


//sum all the keys and devote it with sum of all the values
let obj2 = {1: 6, 2: 7, 3: 8, 4:
        9, 5: 10};

let sumKeys = 0;
let sumValues = 0;
for(let key in obj2) {
    sumKeys += +key
    sumValues += obj2[key]
}
let sumDevoteSum = sumKeys / sumValues
 console.log(sumDevoteSum);
 
 
 //fill the first array with the keys and the second with values of the object
let obj2 = {1: 6, 2: 7, 3: 8, 4:
        9, 5: 10};
let arr3 = [];
let arr4 = [];

for(let key in obj2) {
    arr3.push(+key);
    arr4.push(obj2[key]);
}
console.log(arr3, arr4);


//fill the array with the object values that start with 1 and 2
let obj3 = {
    1: 125,
    2: 225,
    3: 128,
    4: 356,
    5: 145,
    6: 281,
    7: 452,
};

let arr5 = [];

for(let key in obj3) {
    if(obj3[key] < 300) {
        arr5.push(obj3[key])
    }
}
console.log(arr5);


// fill the object with numbers as keys and letters from array as values
let arr = ['a', 'b', 'c', 'd', 'e'];

let obj = {};

    for(let i = 0; i < arr.length; i++) {
        obj[i + 1] = arr[i];
}
 console.log(obj);
 
 
 //fill the objects with letters as keys and numbers as values
 let arr = ['a', 'b', 'c', 'd', 'e'];

let obj = {};

for(let i = 0; i < arr.length; i++) {
    obj[arr[i]] = i + 1
}
console.log(obj)


//calculate how many 3 and how many 2 are in the array
let arr = [1, 2, 3, 2, 4, 3, 5,
    6, 3, 2, 3];

let threeSum = 0;
let twoSum = 0;
for (let i of arr) {
    if(i === 3) {
        threeSum++
    }
    if(i === 2) {
        twoSum++
    }
}
console.log(threeSum, twoSum);