Technology Fundamentals
Data Type
Definition
A data type is a classification of data which tells the compiler or interpreter how the programmer intends to use the data. It determines the possible values for that type, the operations that can be performed on values of that type, and the way values of that type are stored.
Why It Matters
Data types are a fundamental concept that helps prevent errors. By specifying whether a piece of data is a number, text, or a true/false value, the programming language can ensure it is used correctly.
Contextual Example
Common data types include Integer (for whole numbers), Float (for decimal numbers), String (for text), and Boolean (for true/false). Declaring `let age: number = 30;` in TypeScript ensures `age` can only hold numeric values.
Common Misunderstandings
- Some languages like JavaScript are "dynamically typed," meaning variables can hold different data types over time. Others like Java or C# are "statically typed," where a variable's type is fixed when it's declared.
- Data types can be simple (like an integer) or complex (like an object or an array).