Q
How can you comment a single line of code in JavaScript?

Answer & Solution

Answer: Option A
Solution:
In JavaScript, you can comment a single line of code using '//' at the beginning of the line. This syntax tells the JavaScript interpreter to ignore everything from '//' to the end of the line, treating it as a comment. Option C shows a multi-line comment syntax, and option D is not a valid comment syntax in JavaScript. Therefore, option A is the correct way to comment a single line of code.
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What is the correct way to declare a JavaScript class?

A). class Rectangle {}

B). let Rectangle = {}

C). function Rectangle() {}

D). Rectangle {}

What is the purpose of the 'this' keyword in JavaScript?

A). To refer to the current HTML element

B). To refer to the current JavaScript file

C). To refer to the current object

D). To refer to the current function

Which statement correctly declares a JavaScript object?

A). let person = {name: 'John', age: 30};

B). const person = ('name' => 'John', 'age' => 30);

C). const person = ['name', 'John', 'age', 30];

D). var person = {name: 'John', age: 30};

Which operator is used for strict inequality in JavaScript?

A). !==

B). !=

C). <>

D). /=

How do you concatenate strings in JavaScript?

A). Using the + operator

B). Using the - operator

C). Using the * operator

D). Using the / operator

How can you add a new element to the end of a JavaScript array?

A). colors.push('blue');

B). colors.add('blue');

C). colors.insert('blue', colors.length);

D). colors[colors.length] = 'blue';

Which statement correctly declares a JavaScript array?

A). let colors = ['red', 'green'];

B). const colors = {'red', 'green'};

C). const colors = ['red', 'green'];

D). var colors = ('red', 'green');

What is the purpose of the 'return' statement in a JavaScript function?

A). To end the function execution

B). To return a value from the function

C). To print a value to the console

D). To declare a variable

Which method is used to remove the last element from a JavaScript array?

A). colors.pop();

B). colors.removeLast();

C). colors.splice(-1, 1);

D). colors.deleteLast();

What is the purpose of the 'break' statement in a JavaScript switch case?

A). To continue to the next case

B). To exit the switch statement

C). To restart the switch statement

D). To execute the default case