Common Javascript Interview Questions

If you’re preparing for a Javascript interview, you’ll want to be ready to answer questions about string index in Javascript. This article will cover some commonly asked questions and provide you with the information you need to ace your interview.

What is a string index in Javascript?

In Javascript, a string index is the position of a character within a string. Strings in Javascript are zero-indexed, meaning that the first character of a string has an index of 0, the second character has an index of 1, and so on. You can access individual characters in a string by using their index.

For example, if you have the string “hello” and you want to access the first character, you would use the index 0 like this:

var str = "hello";
var firstChar = str[0]; // This will return "h"

Common interview questions about string index in Javascript

Here are some common interview questions you may encounter about string index in Javascript:

1. What is the index of the first character in a string in Javascript?
2. How can you access the last character in a string in Javascript?
3. What happens if you try to access a character at an index that doesn’t exist in the string?
4. Can you change the value of a character in a string by using its index?

Conclusion

Understanding how string index works in Javascript is important for anyone interviewing for a Javascript developer role. Make sure to practice these concepts and be prepared to answer questions about string index during your interview. Good luck!