Lære Data Types

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In JavaScript, you will work with several basic data types. The most common are string, number, and boolean.

A string is used for text, such as names, messages, or any sequence of characters. For instance, "Alex" is a string that might represent a user's name.

A number is any numeric value, whether it's an integer like 28 or a decimal like 3.14. Numbers are commonly used for things like age, scores, or prices.

A boolean is a type that can only be true or false. Booleans are typically used for values that answer yes/no questions, such as whether a user is logged in.


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const name = "Alex"; // string
const age = 25; // number
const isActive = true; // boolean

console.log(name);
console.log(age);
console.log(isActive);

JavaScript handles these types flexibly, and you do not need to declare the type when creating a variable. The type is determined by the value you assign. For example, assigning "Alex" to a variable makes it a string, while assigning 28 makes it a number. Booleans are especially useful for controlling logic, like showing or hiding content based on whether a condition is true.

Understanding these data types is essential for managing user data, performing calculations, and making decisions in your code. You will encounter them constantly as you build React Native apps, from displaying user profiles to checking if someone is logged in.

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