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JavaScript stores different kinds of data using data types. The main ones are:
- String: text;
- Number: numeric values;
- Boolean: true / false;
- Null: intentional empty value;
- Undefined: not assigned.
12345678910111213// Assigning different data types to variables let userName = "Alice"; // string let userAge = 30; // number let isMember = true; // boolean let middleName = null; // null let address; // undefined console.log(userName); // Output: Alice console.log(userAge); // Output: 30 console.log(isMember); // Output: true console.log(middleName); // Output: null console.log(address); // Output: undefined
You can perform various basic operations with these data types. With numbers, you can use addition (+), subtraction (-), multiplication (*), and division (/).
With strings, the + operator is used for concatenation, meaning joining two or more strings together. JavaScript sometimes automatically converts one data type to another when performing operations—this is called type coercion. For example, adding a string and a number results in a string because JavaScript converts the number to a string.
12345678910111213141516171819// Basic operations let a = 10; let b = 5; let sum = a + b; // Addition: 15 let difference = a - b; // Subtraction: 5 let greeting = "Hello, "; let name = "Bob"; let welcomeMessage = greeting + name; // Concatenation: "Hello, Bob" let result = "Age: " + 25; // Type coercion: "Age: 25" let mixed = 5 + "5"; // Type coercion: "55" console.log(sum); // Output: 15 console.log(difference); // Output: 5 console.log(welcomeMessage); // Output: Hello, Bob console.log(result); // Output: Age: 25 console.log(mixed); // Output: 55
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