String Operations

What are string operations?

String operations allow you to change strings by adding, removing, re-ordering etc. They let you extract parts of strings, change formatting, search for text, and more.

Benefits of string operations?

• Process user input and game text
• Extract data from strings
• Format messages and output
• Search and replace text
• Validate and parse information

const message = "Welcome to the Game!";

console.log(message.length); // 21
console.log(message.toUpperCase()); // WELCOME TO THE GAME!
console.log(message.toLowerCase()); // welcome to the game!
console.log(message.charAt(0)); // W
console.log(message.indexOf("Game")); // 15
console.log(message.substring(0, 7)); // Welcome
console.log(message.includes("Game")); // true
console.log(message.replace("Game", "Adventure")); // Welcome to the Adventure!

const words = message.split(" ");
console.log(words); // ["Welcome", "to", "the", "Game!"]

const joined = words.join("-");
console.log(joined); // Welcome-to-the-Game!

What does this code do?

• Uses .length to count characters
• Uses .toUpperCase() and .toLowerCase() to change case
• Uses .charAt() to get a specific character
• Uses .indexOf() to find where text starts
• Uses .substring() to extract part of string
• Uses .includes() to search for text
• Uses .replace() to substitute text
• Uses .split() and .join() to break apart and reassemble strings

Try It Yourself

%%js // CODE_RUNNER: string-operations const text = “ sword,shield,potion “; const trimmed = text.trim(); console.log(trimmed); const items = trimmed.split(“,”); console.log(items.length); const joined = items.join(“ | “); console.log(joined);