Introduction
In this lab, we will explore the concept of type checking in JavaScript. Specifically, we will focus on the typeof operator and how it can be used to check whether a given value is a string primitive. Through a series of exercises and challenges, you will gain a deeper understanding of this fundamental aspect of JavaScript programming.
This is a Guided Lab, which provides step-by-step instructions to help you learn and practice. Follow the instructions carefully to complete each step and gain hands-on experience. Historical data shows that this is a beginner level lab with a 100% completion rate. It has received a 97% positive review rate from learners.
Checking if a Value is a String
To check if a value is a string, use the typeof keyword followed by the value you want to check. This method only works for string primitives.
Here's an example code that checks if a given value is a string:
const isString = (val) => typeof val === "string";
You can use the isString function like this:
isString("10"); // true
Summary
Congratulations! You have completed the Value Is String lab. You can practice more labs in LabEx to improve your skills.