Modern JavaScript from the Beginning - Second Edition - Array.forEach Method

This video tutorial covers high order array methods, focusing on the foreach method. It explains how foreach takes a callback function to iterate over array elements, demonstrating with both anonymous and named functions. The tutorial also explores additional parameters like index and array in callbacks and shows how to use foreach with arrays of objects to access specific properties.

What is the primary purpose of the foreach method in JavaScript?

• To find a specific element in an array

• To filter elements based on a condition

• To iterate over each element in an array without returning anything

• To return a new array with modified elements

Which of the following is true about the callback function used in the foreach method?

• It must always be a named function

• It returns a value to the foreach method

• It is executed only once for the entire array

• It can be an anonymous function

How can you access the index of the current element in a foreach loop?

• By using a global variable

• By passing it as a second argument to the callback function

• By using a special method called getIndex()

• By declaring it outside the foreach loop

What is the benefit of using a named function as a callback in a foreach loop?

• It prevents the loop from iterating over the array

• It automatically returns the last element of the array

• It makes the foreach loop run faster

• It allows the function to be reused elsewhere

What happens if you try to execute a function passed to foreach with parentheses?

• The function will be executed immediately for the first element only

• The function will be executed for each element twice

• The foreach loop will skip every other element

• The foreach loop will not work as intended

When using foreach on an array of objects, how can you access a specific property of each object?

• By converting the object to a string

• By using the map method

• By using the filter method

• By directly referencing the property using dot notation

Which of the following is a common use case for the foreach method?

• To sort the elements of an array

• To find the maximum value in an array

• To perform an action on each element without modifying the array

• To transform each element and return a new array