Object Functions

Exercise 1

Write a JavaScript program to getthe length of a JavaScript object.
let student = { name : "John Doe", class : "JavaScript", rollno : 12 }

   
let student = {
  name: "John Doe",
  class: "JavaScript",
  rollno: 12
};
const myFunc1 = obj => Object.keys(obj).length;
document.getElementById("ex1").innerText = myFunc1(student);

Exercise 2

Write a JavaScript function to get all the values of an object's values and return a single String of values as an example.
let bio = {name : "Dcoders", course: "JavaScript"}
//Output : "Dcoders JavaScript"

   
let bio = { name: "Dcoders", course: "JavaScript" };
const myFunc2 = obj => Object.values(obj).join(" ");
document.getElementById("ex2").innerText = myFunc2(bio);

Exercise 3

Create a function to where I can pass Object and Property. Return Boolean value if property exists in the given object.
let checkKey( {name:"abc"}, "name") // Output : true
let checkKey( {age:10, color:"red"}, "course"); // Output : false

   
const myFunc3 = (obj, prop) => prop in obj;
document.getElementById("ex3").innerText = myFunc3({name:"abc"},"name");

Exercise 4

Change the value of given object.Concat "Yes" to the value and return new value of an object.
let changeVaIue = {name: "dcoders"} // Output : "yes dcoders"

   
const myFunc4 = obj => "Yes " + Object.values(obj) ;
document.getElementById("ex4").innerText = myFunc4({name:"dcoders"});

Exercise 5

Using Destructuring method, return a value of name key from object.
let getName = { age:20, course:"JavaScript", name:"John Doe"}; Output : John Doe

   

let getName = { age: 20, course: "JavaScript", name: "John Doe" };
const myFunc5 = obj => {
  const { name } = obj;
  return name;
}
document.getElementById("ex5").innerText = myFunc5(getName);

Exercise 6

Remove the "color" property from an object and return a string with remaining key value pairs of an object.
let removeKey({name:"John Doe",age:20,color:"pink"});
Output :- name John doe age 20

   
let removeKey = { name: "John Doe", age: 20, color: "pink" };
const myFunc6 = obj => {
  delete obj.color;
  return Object.entries(obj).flat(Infinity).join(" ")
}
document.getElementById("ex6").innerText = myFunc6(removeKey);

Exercise 7

Create a functions which return value of city from nested object.
let person = { name: "John Doe", address: { city: "Springfield", } }

   
let person = {
  name: "John Doe",
  address: {
    city: "Springfield"
  }
}
const myFunc7 = obj => obj.address.city;
document.getElementById("ex7").innerText = myFunc7(person);

Exercise 8

Create a functions to return an Object from given nested Array.
let GetObj([['age',20],['color','red']]);
{age:20,color:"red"};

   

const myFunc8 = arr => Object.fromEntries(arr);
document.getElementById("ex8").innerText = JSON.stringify(myFunc8([['age', 20], ['color', 'red']]));

Exercise 9

Create a function to takes an Object and return true if value of any key is of Number Datatype.
let checkNumVaIue ({age: 20}); Output: true
let checkNumVaIue ({age: "20"}); Output: false

   
const myFunc9 = obj => 
Object.values(obj).some((ele => typeof ele == 'number'))
document.getElementById('ex9').innerText = myFunc9({ age: "90", age2: 2 })

Exercise 10

Create a function which takes an Array of an Objects and return a String with all the properties of each object.
getStr({name:'John, age:20}, {type:'vehicle', model: 'car'});
Output : "name age type model"

   
const myFunc9 = obj => 
Object.values(obj).some((ele => typeof ele == 'number'))
document.getElementById('ex9').innerText = myFunc9({ age: "90", age2: 2 })

//exercise 10
let tempVar = [{name:'John', age:20}, {type:'vehicle', model: 'car'},{year:2019,BuiltYear:1991}];
let newStr = [];
const myFunc10 = arr => {
arr.forEach(e =>{
newStr.push(Object.keys(e).flat(Infinity).join(" "))
} );
return newStr.join(" ");
}
document.getElementById('ex10').innerText = myFunc10(tempVar);