JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - Introduction to the For Loop - II

The video tutorial explains how to use loops in JavaScript, focusing on iteration, the incremental operator, and accessing array elements. It covers the logic within loops, how to execute them, and the importance of loop conditions. The tutorial also highlights common pitfalls, such as accessing undefined elements, and provides a practical example of listing user names from an array.

What is the initial value of the loop variable 'I' in the given example?

• Length of the array

• Undefined

• 0

• 1

Which part of the for loop determines how long the loop will run?

• Initialization

• Condition

• Increment

• Body

What is the purpose of the increment expression in a for loop?

• To terminate the loop

• To initialize the loop

• To check the loop condition

• To update the loop variable

How can you access the first element of an array in JavaScript?

• array[-1]

• array[1]

• array[0]

• array[first]

What happens if you use 'less than or equal to' in the loop condition when iterating over an array?

• The loop does not run

• The loop accesses an undefined element

• The loop skips the last element

• The loop runs indefinitely

Why does the loop return 'undefined' when the condition is set to 'less than or equal to' the array length?

• Because the array is empty

• Because the loop variable exceeds the array index

• Because the array length is zero

• Because the loop variable is not initialized

What is the index value of the last element in an array of length 4?

• 3

• 4

• 5

• 2