JavaScript Basics and Features

Which of the following statements best describes the use of JavaScript in web development before and after its introduction?

Consider a scenario where you need to include JavaScript in an HTML document. You aim to ensure that the HTML content loads and renders as quickly as possible. Which placement strategy is generally considered best practice?

Given the following JavaScript code snippet, what will be the output displayed in the console?

let str = "42";
let num = 8;
console.log(str + num);
console.log(parseInt(str) + num);

In JavaScript, how do let and const differ in declaring variables, and what implications does this have for variable assignment?

What is function hoisting in JavaScript, and how does it affect different types of function declarations?

In JavaScript, var is preferred over let and const for declaring variables due to its more modern features.

A JavaScript function is executed automatically when it is defined.

In JavaScript, String(42) and 42.toString() both convert the number 42 to the string '42'.

In JavaScript, parseInt() can parse strings containing alphabetic characters before the number, but ignores them if they appear after the number.

JavaScript's lexical scoping means that a variable's scope is determined when the function is called, not where it is defined.

Given a JavaScript object myObj, which of the following is the correct way to both access its property propertyName and call its method methodName?

Which of the following is the most accurate description of how JavaScript handles the addition of new properties to an existing object?

What is the primary difference between creating a JavaScript String, Number, or Boolean object using the new keyword versus using a literal or direct value?

If today is a JavaScript Date object, which method would you use to extract the month as an index number (0-11)?

What happens if you use new Array(10) in JavaScript, and why?

JavaScript objects can only store a single data type, such as numbers or strings, but not both within the same object.

In JavaScript, the delete operator can be used to remove properties from an object, but it will return an error if the property does not exist.

In JavaScript, when using the new Array(n) constructor with a single numeric argument, n represents the value of the first element in the array.

When creating a Date object in JavaScript, it is configured to capture the system's local time without any capacity to ensure accuracy to UTC or GMT.

Object methods are accessed and called by appending parentheses () after the object's property name.

Which of the following scenarios best illustrates how the continue statement alters the flow of a loop in JavaScript?

Consider a situation where you need to execute a block of code at least once, and then continue executing it as long as a certain condition remains true. Which type of loop structure is most suitable for this purpose in JavaScript?

In the context of JavaScript control structures, what is the primary role of the break keyword within a switch statement?

Under what condition will the code block inside a standard if statement in JavaScript be executed?

How does a for loop's 'modifier' component primarily contribute to the loop's overall behavior in JavaScript?

In a switch statement, omitting the break statement will prevent the next case from being executed, regardless of whether its evaluation matches the expression.

The primary difference between a while loop and a do...while loop is that the while loop always executes its code block at least once.

A for loop must always include an initializer, a condition, and a modifier to control its execution flow.

The continue statement, when encountered within a loop, terminates the loop entirely and transfers control to the statement immediately following the loop.

In an if...else if...else If statement, multiple else if blocks can be used to test different conditions, allowing for multiple possible execution paths depending on which condition is met.