Podcast
Questions and Answers
What does the map() function do?
What does the map() function do?
- Filters the array based on a condition
- Reduces an array into a single value
- Sorts the array in ascending order
- Creates a new array of the same size with transformed values (correct)
How is the reduce() function different from other array functions?
How is the reduce() function different from other array functions?
- It reduces an array into a single value (correct)
- It duplicates the original array
- It creates a new array based on a condition
- It transforms each element of the array
In the reduce() function, what are the two required parameters for the callback function?
In the reduce() function, what are the two required parameters for the callback function?
- Current value and next element
- Previous value and current element (correct)
- Current value and previous element
- Previous value and next element
What does the total variable represent in the reduce() example provided?
What does the total variable represent in the reduce() example provided?
If you wanted to create a new array by filtering based on a specific condition, which function would be more appropriate than map()?
If you wanted to create a new array by filtering based on a specific condition, which function would be more appropriate than map()?
What is the purpose of using the map() function with DOM nodes as shown in Listing 10.2?
What is the purpose of using the map() function with DOM nodes as shown in Listing 10.2?
What does the 'sort()' function do in JavaScript?
What does the 'sort()' function do in JavaScript?
When sorting an array of objects based on a property, what does the compare function return if two values are equal?
When sorting an array of objects based on a property, what does the compare function return if two values are equal?
Which method is used to create multiple instances of objects with the same properties efficiently in JavaScript?
Which method is used to create multiple instances of objects with the same properties efficiently in JavaScript?
In JavaScript, what does the 'prototype' property of a function object initially contain?
In JavaScript, what does the 'prototype' property of a function object initially contain?
Why is using prototypes considered superior when creating objects with methods in JavaScript?
Why is using prototypes considered superior when creating objects with methods in JavaScript?
Which syntax can be used for a concise comparison function when sorting an array based on object properties?
Which syntax can be used for a concise comparison function when sorting an array based on object properties?
