Question 1: Difference Between "null" and "undefined" data type with example? Question 2: What type of variable should you initialize at the time of declaration? Question 3: Guess the Output and Explain Why?

let languages = "java javaScript python cSharp";
let result = languages.lastIndexOf("S");
console.log(result)

Question 4: Guess the Output and Explain Why?

let variable = "hello programmers";
let result = Number(variable);
console.log(result);

Question 5: Guess the Output and Explain Why?

let num1 = 32;
let num2 = "32";
let result1 = num1 !== num2;
let result2 = num1 != num2;
console.log(result1,result2);

Question 6: Guess the Output and explain Why?

let str =  "Hello Programmers";
let result = str.includes("r");
console.log(result);

Question 7: Guess the Output and Explain Why?

let num1 = 2;
let num2 = 5;
let result = num1**num2*2;
console.log(result);

Question 8: Guess the Output and Explain Why?

let num1 = [1,2,4,5];
let num2 = [6,5,8,0];
let result = num1.concat(num2);
console.log(result)

Question 9: Guess the Output and Explain Why?

let a = 5;
let b = 7;
let c = 8;
let result = a<b>c;
console.log(result)

Question 10: If your state split into four equal parts such that in each part there are 1/4 number of people live. You have to find How many people would live in each part?

Question 1: Explain practical use case of break and continue statement. When to use which statement?

Question 2: Guess the Output and Explain Why?

let  i  =  0;
for(i;i<5;i++){
console.log(i);
}

Question 3: Write a simple Program in which You have to print first 10 number in descending order?

Question 4: Lets say John is looking a new country to live in. He want to live in a country that speaks English, has less than 10 million people. One of the food option between these two must present Spanish food Or English food.

Write an if statement to help john figure out Your country is right for him?

Question 5: Guess the Output And Explain Why?

	for(let i = 0;i<10;i++){
	console.log(i);
}
	console.log(i)

Question 6: use nested-if statement to check your age>18 than check your height height > 5.10.
If both true show any message(I can sit in __ exam) in the console?

Question 7: Create two variables grade and passingYear.Check if your grade == "A" and passingYear < 2020 with the help of ternary operator(Not allowed to use any logical operator).If both condition true print on console Qualify. Otherwise Fail

Question 1: Create a function Declaration called describeYourState Which take three parameters 'Population', 'traditional food' and 'historical place'. Based on this input function should return a string with this format. My state population is __. Its traditional food is __ and historical place name is __

Question 2: Create a function expression which does the exact same thing as defined in Question 1

Question 3: What are default values of function. And How we can use them?

Question 4: Identify which type of value passed below into the function greet()

let  person  = {
name:"john",
age:25
}
function  greet(person){
person.name  =  `Mr ${person.name}`
console.log(`Welcome ${person.name}`)
}
greet(person)

Question 5: Explain use of return statement inside the function?

Question 6: What are higher order functions in JavaScript?

Question 7: Create higher order function named as transformer which take string and firstUpperCaseWord() as an arguments. And return string with first word in upperCase

Question 8: Difference between setTimeOut and setInterval function. Also write syntax of both methods with specifying what are required and optional arguments in both function

Question 9: Guess the Output And Explain Why?

let arrowFunction = (name ="Coders") => {`Welcome ${name}`};

console.log(arrowFunction("Programmers"));

Question 1: Guess the Output And Explain Why?

console.log(Math.round(Math.random() * 10 ));

Question 2: Create an object called 'Country' for a country of your choice, containing properties 'country', 'capital', 'language', 'population' and 'neighbours'

1. Increase the country population by two million using dot notation.
2. Decrease the country population by one million using bracket notation.

Question 3: Explain difference between function and method with the help of example?

Question 4: Guess the Output and explain Why?

let car = {
color:"Blue",
model:2021,
company:"Toyota"
}
let carColor = "Blue";
console.log(car[carColor]);
console.log(car.carColor);

Question 5: Explain this keyword with one real world example?

Question 6: Create a method describeCar inside car object in which you have to print like this in console using template literals

Company of my car is __ . It color is __ And Model of my car is __

Question 7: Generate random numbers between 0 and 10 using trunc method of MATH object

Question 8: Guess the Output and Explain Why?

let arr = [1,2,3,4];
arr.forEach(elem =>{
	if(elem == 1){
	continue;
	}
	console.log(elem);
})

Question 9: Difference between call and apply method in term of implementation?

Question 10: Guess the Output And Explain Why?

let arr = [1,2,3,4];
for(let elem in arr){
console.log(elem);
}

Question 1: Explain difference between innerText and innerHTML with the help of example?

Question 1: Create regex for password with the following validations.

1. Length of password at least of 8 characters
2. contain at least one special character
3. contain at least one alphabet (a-z) character

Question 1: Difference between slice and splice method of array?

Question 2: You have given an array of 5 elements(1-5). Your task is defined as below.

1. You have to delete 2 elements starting from index 2.
2. You have to add 3 new elements on that position of Your choice.
3. Display the 2 deleted elements in console.

Question 3: What happens if we use negative number inside slice method? Example : arr.slice(-2);

Question 4: Write three different methods/approaches to get last element of the array?

Question 5: One key difference between map and filter method of array?

Question 6 You have given an array of scores in which score of each student stored. Create a new array with the help of original scores array in which only those scores exist greater than 75%

let totalScore = 150;
let scores = [55,76,35,77,88,97,120,136,140];

Question 7: You have given an array of numbers nums. You have to find sum of all array elements using reduce method?

let nums = [2,3,5,7,8,4,9];

Question 8: You have given an array of numbers nums. You have to find the index of value 8 using built-in method of array?

let nums = [2,3,5,6,8,6,4,8];

Question 9: Explain working difference between find and findIndex method?

Question 10: Difference between flat and flatMap with details. Also Explain when to use which method?

Question 11: By default how sort method sort the array.

Question 12: Guess the Output and Explain Why?

let arr = [1,2,3,4];
let result = arr.splice(1,2).pop();
console.log(result);

Question 13: You have given an array of numbers nums. You have to check if all elements of the array > 15 using built-in array method.

let nums = [16,17,18,28,22];

Question 1: How can we get current time in millisecond?

Question 2: Explain difference between getDate() and getDay() method of current Date?