The main advantage of using arrow functions comes from the lack of a new _________ binding.
- execution context
- lexical scope
- closure
- variable
The main advantage of using arrow functions is that they do not create a new execution context or this binding. Instead, they capture the this value from their surrounding lexical scope. This behavior is known as "lexical scoping," and it provides a predictable way to maintain the value of this in various situations. Thus, the correct option is execution context.
What is the result of the expression NaN == NaN in JavaScript?
- TRUE
- FALSE
- NaN
- Throws an error
In JavaScript, NaN is not equal to itself. So, the expression NaN == NaN evaluates to false. This behavior is because NaN represents a value that is "Not-a-Number," and it's treated as unordered and not equal to any other value, including itself.
What is the purpose of the "else" statement in JavaScript?
- To specify an alternate code block to execute when the condition is false
- To terminate the program
- To define a variable
- To loop through an array
The "else" statement in JavaScript serves the purpose of specifying an alternate code block to execute when the condition specified in the "if" statement is false. It provides an alternative path for your code's execution.
In JavaScript, the arithmetic operator _______ is used to exponentiate a number.
- **
- ^
- exp
- pow
In JavaScript, the ** operator is used to exponentiate a number. For example, 2 ** 3 evaluates to 8, as it calculates 2 raised to the power of 3. This operator was introduced in ECMAScript 2016 (ES6) to provide a concise way of performing exponentiation.
What is the purpose of the innerHTML property in JavaScript?
- To access the element's content
- To set the element's ID
- To toggle element visibility
- To retrieve the element's tag name
The innerHTML property in JavaScript is used to access the content of an HTML element. It allows you to retrieve or modify the HTML content within the element, including any child elements, text, or HTML tags.
To strictly compare the inequality of two operands without type coercion, use _______.
- ==
- ===
- !=
- !==
To strictly compare the inequality of two operands without type coercion in JavaScript, you should use the === operator. This operator checks both the value and the data type of the operands. In contrast, the == operator performs type coercion and may not provide the desired strict comparison.
What is the purpose of the capture parameter in addEventListener method?
- To specify the event phase
- To control event order
- To attach multiple listeners simultaneously
- To prevent event propagation during capture phase
The capture parameter in the addEventListener method is used to specify the event phase during which the listener should be triggered. When set to true, the listener is triggered during the capturing phase, and when set to false, it is triggered during the bubbling phase. This parameter helps control the order of event execution.
Which method can be used to insert an HTML element as the first child of a parent element?
- appendChild()
- insertBefore()
- prepend()
- createElement()
To insert an HTML element as the first child of a parent element, you should use the prepend() method. This method adds the element as the first child, making it the top element within the parent. appendChild() adds it as the last child. insertBefore() requires specifying a reference node. createElement() creates an element but doesn't insert it.
How does the "this" keyword behave in event handlers?
- It refers to the element that triggered the event.
- It refers to the document object.
- It always refers to the window object.
- It throws an error since "this" cannot be used in event handlers.
In event handlers, such as those in JavaScript for the web, the "this" keyword typically refers to the DOM element that triggered the event. This behavior allows developers to access and manipulate the specific element that triggered the event, making it a powerful feature in front-end web development.
If you’re building a calculator application using JavaScript, and you want to evaluate operations (+, -, *, /) based on user input, how would you structure a switch statement to handle this?
- Create separate case statements for each operation (+, -, *, /) and perform the corresponding calculation within each case.
- Use regular expressions to match the input against valid operations and handle them accordingly in a single case.
- Convert the user input into a numerical expression and evaluate it within the switch statement.
- Use an if-else statement to check for each operation and perform the corresponding calculation.
To handle different mathematical operations (+, -, *, /) based on user input in a calculator application, it's best to create separate case statements for each operation within a switch statement. This approach is clear and maintainable, allowing you to perform the corresponding calculation for each operation. Using regular expressions within a single case or converting the input into a numerical expression unnecessarily complicates the code. An if-else statement is less idiomatic and less efficient for this purpose.