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Test: Functions - 2 - Software Development MCQ


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15 Questions MCQ Test JavaScript for Web Development - Test: Functions - 2

Test: Functions - 2 for Software Development 2024 is part of JavaScript for Web Development preparation. The Test: Functions - 2 questions and answers have been prepared according to the Software Development exam syllabus.The Test: Functions - 2 MCQs are made for Software Development 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Functions - 2 below.
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Test: Functions - 2 - Question 1

What is a function in JavaScript?

Detailed Solution for Test: Functions - 2 - Question 1

A function in JavaScript is a reusable block of code that performs a specific task when called.

Test: Functions - 2 - Question 2

What is the difference between parameters and arguments in JavaScript?

Detailed Solution for Test: Functions - 2 - Question 2

Parameters are the variables defined in a function's declaration, while arguments are the actual values passed to the function when it is called.

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Test: Functions - 2 - Question 3

Which of the following statements is true regarding JavaScript functions?

Detailed Solution for Test: Functions - 2 - Question 3

JavaScript functions can be used before they are declared due to hoisting, which moves function declarations to the top of the scope.

Test: Functions - 2 - Question 4

What is the purpose of the 'return' statement in JavaScript functions?

Detailed Solution for Test: Functions - 2 - Question 4

The 'return' statement is used to output a value from a function. It also terminates the execution of the function.

Test: Functions - 2 - Question 5

Which keyword is used to call a function in JavaScript?

Detailed Solution for Test: Functions - 2 - Question 5

The 'call' keyword is used to call a function in JavaScript.

Test: Functions - 2 - Question 6

What will be the output of the following code?
function greet() {
  console.log("Hello!");
}

console.log(typeof greet);

Detailed Solution for Test: Functions - 2 - Question 6

The 'typeof' operator returns the type of the operand. In this case, it returns "function" because 'greet' is a function.

Test: Functions - 2 - Question 7

What will be the output of the following code?
function sum(a, b) {
  return a + b;
}

var result = sum(3, 4);
console.log(result);

Detailed Solution for Test: Functions - 2 - Question 7

The 'sum' function returns the sum of its two parameters. When called with 'sum(3, 4)', it returns 7, which is assigned to the 'result' variable and then printed.

Test: Functions - 2 - Question 8

What will be the output of the following code?
function outer() {
  var x = 10;

  function inner() {
    console.log(x);
  }

  return inner;
}

var fn = outer();
fn();

Detailed Solution for Test: Functions - 2 - Question 8

The 'inner' function is defined inside the 'outer' function and has access to the variables in its parent scope, including 'x'. When 'fn()' is called, it prints the value of 'x', which is 10.

Test: Functions - 2 - Question 9

What will be the output of the following code?
var x = 5;

function test() {
  console.log(x);
  var x = 10;
}

test();

Detailed Solution for Test: Functions - 2 - Question 9

In the 'test' function, the 'console.log(x)' statement is executed before the 'var x = 10' line. At that point, 'x' is undefined, so it prints undefined.

Test: Functions - 2 - Question 10

What will be the output of the following code?
function multiply(a, b = 2) {
  return a * b;
}

console.log(multiply(3));

Detailed Solution for Test: Functions - 2 - Question 10

The 'multiply' function accepts two parameters, 'a' and 'b', with 'b' having a default value of 2. When called with 'multiply(3)', it uses the default value of 'b' (2) and returns the product of 'a' (3) and 'b' (2), which is 6.

Test: Functions - 2 - Question 11

What will be the output of the following code?
var x = 10;

function outer() {
  function inner() {
    console.log(x);
  }

  inner();
  var x = 20;
}

outer();

Detailed Solution for Test: Functions - 2 - Question 11

The 'inner' function is called before the 'x' variable is defined within the 'outer' function. Therefore, when 'console.log(x)' is executed, 'x' is undefined.

Test: Functions - 2 - Question 12

What will be the output of the following code?
function greet(name) {
  console.log("Hello, " + name + "!");
}

greet();

Detailed Solution for Test: Functions - 2 - Question 12

The 'greet' function expects a parameter 'name' to be passed when called. Since no argument is provided when calling 'greet()', the 'name' parameter is undefined, resulting in the output "Hello, undefined!".

Test: Functions - 2 - Question 13

What will be the output of the following code?
function outer() {
  var x = 10;

  function inner() {
    console.log(x);
  }

  x = 20;
  return inner;
}

var fn = outer();
fn();

Detailed Solution for Test: Functions - 2 - Question 13

The 'inner' function is defined inside the 'outer' function and has access to the variables in its parent scope, including 'x'. When 'fn()' is called, it prints the value of 'x', which is 10.

Test: Functions - 2 - Question 14

What will be the output of the following code?
var x = 10;

function test() {
  if (x === 10) {
    var x = 20;
  }

  console.log(x);
}

test();

Detailed Solution for Test: Functions - 2 - Question 14

The 'var x = 20' declaration inside the 'if' statement creates a new variable 'x' with block scope. Since the 'console.log(x)' statement is outside the block, it refers to the outer variable 'x', which is undefined.

Test: Functions - 2 - Question 15

What will be the output of the following code?
function add(a, b) {
  return a + b;
}

function multiply(a, b) {
  return a * b;
}

var result = add(2, multiply(3, 4));
console.log(result);

Detailed Solution for Test: Functions - 2 - Question 15

The 'multiply' function is called with arguments '3' and '4', returning the result '12'. This result is then passed as an argument to the 'add' function along with '2', resulting in the final result of '14', which is printed.

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