JavaScript tasks for beginners

Posted: 19-11-2022 | Views: 6
JavaScript tasks for beginners

// Task 1

const obj = {
    a1: "test",
    b1: 4,
    c1: "hello",
    d1: 6,
    e1: "welcome"
  }

// By making use of the Object entries method, show the properties whose type is number in the console

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// Task 2

const arr  = ['work', 'eat', 'sleep']

// Swap the last element with the first element of the given array

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// Task 3

let arr1 = ['sleep', 'work', 'exercise']

// Sort the given array alphabetically and find the 1st element

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// Task 4

const arr1 = [2, 4, 7, 9, 11, 13, 14, 15 6, 8];

// Find values dividing by index 2 from the given array

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// Task 5

let names = ['Tomas', 'Maria', 'Katty'];
let surnames = ['Swift', 'Perry', 'Jonatan'];

// Create the new array by combining the names and surnames properly by using the given arrays

// Result must be: ['Tomas Jonatan', 'Maria Perry', 'Katty Swift']

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// Task 6

const string = "Lorem ipsum is a placeholder text commonly used to lorem demonstrate the visual form of a document or a typeface without relying on meaningful lorem content."

// Capitalize the first letter of the given sentence and replace all lorem words with “graphic”

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Tapsririq 7

const arr = [ 'Black Sea', 'Caribbean Sea', 'North Sea', 'Baltic Sea', 'Red Sea' ]

// Delete the word 'Sea' from each item of the given array

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// Task 8

const arr = [
{ obj: {}, arr1: [], str: "", nmb: 77 },
{ obj: {}, arr1: [{str: ""}], str: "", nmb: 77 },
{ obj: {}, arr1: [{str: ""}], str: "", nmb: 77 },
{ obj: {}, arr1: [], str: "", nmb: 77 }
]

// Finding objects whose property is array and whose length is greater than 0 from the given array

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// Task 9

const arr = [
{ a { b: { c: } } }
{ a { b: { c: } } }
{ a { b: { c: } } }
{ a { b: { c: } } }
]

// Fix the code error in the given array

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// Task 10

const arr = [
{ name: "miki", surname: "Jonatan", "age": "21" },
{ name: "miki", surname: "Jonatan", "age": "21" },
{ name: "miki", surname: "Jonatan", "age": "21" },
]

// Convert the age property to Number type in the given array. Then the names and surnames should be written with upper case

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// Task 11

let d1 = "2015-03-25"
let d2 = "2015-06-25"
let d3 = "2015-03-15"

// Compare the given dates and find the largest one

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// Task 12

let d1 = "2015-03-25"

// Add 5 days to the given date and show the result

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// Task 13

// Using the Math method, create a method that can show random numbers from 1 to 20

// Then you write a certain condition, whenever the number is even, log should be written

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// Task 14

const arr1 = [2, 4, 6, 8];
const arr2 = ['eat', 'work', 'sleep'];
const arr3 = ['work', 'exercise', 1, true];

// Finding mixed data types from given arrays

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// Task 15

const arr = ["5 1", "98", "1 2 3", "0"]

// Convert the given array elements to the correct number type and calculate sum with reduce method

// Note: Note the spaces between the values. Spaces should be deleted. Example tip: "1 2 3" => "123"

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// Task 16

const string = "can be used to perform case-insensitive more global searches"

// Capitalize the first letter of the words in the given sentence

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// Task 17

// Create a function that shows us our age by adding our date of birth

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// Task 18

// Create a function that shows how many days we have lived so far by adding our age

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// Task 19

const = [
{ person: { age: "29", salary: "300" } },
{ person: { age: "19", salary: "400" } },
{ person: { age: "9", salary: "500" } },
{ person: { age: "18", salary: "600" } },
]

// Calculate the total salary in the given array for those whose age-i is greater than 18

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// Task 20

// Create a arrow function that calculates the square of a number

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// Task 21

// Print the EVEN numbers from 10 to 49

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// Task 22

// Combine the given objects

const myObject1 = {
  brand: 'Ford',
  model: 'Mustang',
  color: 'red'
}

const myObject2 = {
  type: 'car',
  year: 2021, 
  color: 'yellow'
}

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// Task 23

const fruits = ['Apple', 'Banana', 'Strawberry', 'Banana', 'Mango', 'Cherry', 'Banana', 'Mango',];

// Delete duplicate values from given array

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// Task 24

const arr = ["Tomas", 54, "Rihanna", 49, { age: 88 }, [5], "Javascript"]

// Filter the elements whose types are number in the given array

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// Task 25

// Create a method using the Ternary operator to show is day or night

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// Task 26

// Finding the country object where countryCode is 994

const demoData = {
  data: [
    {
      period: "Month",
      start_date: "2012-06",
      end_date: "2012-07",
      attributes: {},
      measures: {
        Visits: 1000000,
      },
      SubRows: [
        {
          country: "Albania",
          measures: {
            Visits: 50,
            countryCode: "67",
          },
          SubRows: null,
        },
        {
          country: "Germany",
          measures: {
            Visits: 300,
            countryCode: "154",
          },
          SubRows: null,
        },
        {
          country: "Azerbaijan",
          measures: {
            Visits: 100,
            countryCode: "994",
          },
          SubRows: null,
        },
      ],
    },
  ],
};

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// Task 27

// Combine the given strings

let text1 = "When used on strings";
let text2 = "the + operator is called the concatenation operator";
let text3 = "+"

Result must be: 
When used on strings, the "+" operator is called the concatenation operator.

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// Task 28

// Combine the given values

let text1 = 89;
let text2 = "The temperature is";
let text3 = "Celsius"

Result must be: 
The temperature is 89 Celsius

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// Task 29

const car = {
    type:"Fiat", 
    model:"500", 
    color:"white",
    details: {
       year: 2015
    }
 };

 Add driverName property to car details object not car object. Example: => [driverName: "Tomas"]

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// Task 30

const car = {
    type:"Fiat", 
    model:"500", 
    color:"white",
    details: {
       year: 2015
    }
 };

 Remove year property from car object

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// Task 31

let color: "red"

const car = {
   type:"Fiat", 
   model:"500",
   details: {
      year: 2015
   }
};

Add color to car object

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