JavaScript Test

What is an arrow function in JavaScript?

• A method for sorting arrays in JavaScript

• A concise way to write functions using '=>' syntax.

• A way to draw shapes in JavaScript

• A type of data structure in JavaScript

How do you declare a multidimensional array in JavaScript?

• const multiArray = [[1, 2], [3, 4], [5, 6]];

• var multiArray = [[1, 2], [3, 4], [5, 6]];

• let multiArray = [[1, 2], [3, 4], [5, 6]]

• let multiArray = [[1, 2], [3, 4], [5, 6]];

Explain the syntax of a for loop in JavaScript.

• for(init; cond; iter) { // code block }

• for(initialization; condition; iteration) { // code block to be executed }

• for(init; cond; iter) { code block }

• for(init; cond; iter) // code block

When would you use a switch case statement in JavaScript?

• When you need to handle only one condition

• When you want to execute the same block of code for all conditions

• When you want to execute asynchronous code

• When you have multiple conditions to evaluate and want to execute different blocks of code based on each condition.

What are the different data types in JavaScript?

• integer

• undefined, null, boolean, number, string, object, symbol

• array

• float

How can you perform mathematical operations in JavaScript?

• You can perform mathematical operations in JavaScript using string concatenation.

• You can perform mathematical operations in JavaScript using logical operators.

• You can perform mathematical operations in JavaScript using arithmetic operators.

• You can perform mathematical operations in JavaScript using comparison operators.

Define a function in JavaScript.

• def functionName(parameters) { // code block }

• function functionName(parameters) { // code block }

• functionName(parameters) { // code block }

• function functionName(parameters) { // code block

What is the purpose of a for loop in JavaScript?

• To iterate over a block of code multiple times

• To play music

• To send emails

• To cook dinner

How does a while loop differ from a for loop in JavaScript?

• A while loop is condition-based, while a for loop is counter-based.

• A while loop is used for iterating over arrays, while a for loop is used for checking conditions.

• A while loop is counter-based, while a for loop is condition-based.

• A while loop is more efficient than a for loop in terms of performance.

Explain the concept of variables in JavaScript.

• Variables in JavaScript are not supported in modern browsers.

• Variables in JavaScript are used for styling web pages.

• Variables in JavaScript are only used for mathematical calculations.

• Variables in JavaScript are containers for storing data values.