String

A String is a sequence of characters used to represent text in programming. Strings can include letters, numbers, symbols, and spaces. In most programming languages, strings are a fundamental data type and can be manipulated using various built-in methods and functions.

Examples:

JavaScript:

1. Creating Strings:

   let greeting = "Hello, world!";
   let singleQuoteString = 'Single quotes work too.';
   let templateLiteral = `You can use template literals for strings too.`;
   

2. String Concatenation:

   let firstName = "John";
   let lastName = "Doe";
   let fullName = firstName + " " + lastName;
   console.log(fullName); // Output: John Doe
   

3. String Methods:

   let message = "JavaScript is awesome!";
   
   // Length of the string
   console.log(message.length); // Output: 21
   
   // Convert to uppercase
   console.log(message.toUpperCase()); // Output: JAVASCRIPT IS AWESOME!
   
   // Convert to lowercase
   console.log(message.toLowerCase()); // Output: javascript is awesome!
   
   // Find a substring
   console.log(message.indexOf("awesome")); // Output: 15
   
   // Extract a substring
   console.log(message.slice(0, 10)); // Output: JavaScript
   
   // Replace a substring
   let newMessage = message.replace("awesome", "fantastic");
   console.log(newMessage); // Output: JavaScript is fantastic!
   

4. Template Literals:

   let age = 30;
   let introduction = `My name is ${fullName} and I am ${age} years old.`;
   console.log(introduction); // Output: My name is John Doe and I am 30 years old.
   

5. Multiline Strings:

   let multilineString = `This is a string
   that spans across
   multiple lines.`;
   
   console.log(multilineString);
   // Output:
   // This is a string
   // that spans across
   // multiple lines.