JavaScript is a versatile programming language primarily used for client-side web development. It's known for its ability to create dynamic and interactive web pages. It is a powerful language with a wide range of applications beyond web development, including server-side programming (with Node.js), mobile app development (with frameworks like React Native), and even desktop application development.
In JavaScript, we can find the length of a string using the "length" property. For example:
let myString = "Hello, world!";
let lengthOfString = myString.length;
console.log(lengthOfString); // Output: 13
This will output the length of the string, which is the number of characters it contains.