Data types in TypeScript Last Updated : 21 Jan, 2025 Comments Improve Suggest changes 19 Likes Like Report In TypeScript, a data type defines the kind of values a variable can hold, ensuring type safety and enhancing code clarity.Primitive Types: Basic types like number, string, boolean, null, undefined, and symbol.Object Types: Complex structures including arrays, classes, interfaces, and functions.Primitive TypesPrimitive types are the most basic data types in TypeScript. They represent simple, immutable values and are directly assigned.TypeKeywordDescriptionNumbernumberRepresents both integer and floating-point numbers.StringstringRepresents textual data.BooleanbooleanRepresents logical values: true or false.NullnullRepresents the intentional absence of any object value.UndefinedundefinedRepresents an uninitialized variable.SymbolsymbolRepresents a unique, immutable value, often used as object keys.BigIntbigintRepresents integers with arbitrary precision.Object TypesObject types are more complex structures that can contain multiple values and functions. They are mutable and can be manipulated after creation.TypeDescriptionObjectRepresents any non-primitive type; however, its use is discouraged in favor of more specific types.ArrayRepresents a collection of elements of a specific type.TupleRepresents an array with a fixed number of elements of specific types.EnumRepresents a set of named constants, allowing for a collection of related values.FunctionRepresents a callable entity; can define parameter and return types.ClassDefines a blueprint for creating objects with specific properties and methods.InterfaceDescribes the shape of an object, specifying property names and types.Advanced TypesTypeScript also offers advanced types that provide additional capabilities for complex type definitions:TypeDescriptionUnion TypesAllows a variable to hold one of several types, providing flexibility in type assignments.Intersection TypesCombines multiple types into one, requiring a value to satisfy all included types.Literal TypesEnables exact value types, allowing variables to be assigned specific values only.Mapped TypesCreates new types by transforming properties of an existing type according to a specified rule.Best Practices of Using Data types in TypeScriptUse let and const Instead of var: Prefer let and const for block-scoped variables to avoid issues with hoisting and scope leakage. Avoid the any Type: Refrain from using any as it bypasses type checking; opt for specific types to maintain type safety. Leverage Type Inference: Allow TypeScript to infer types when possible, reducing redundancy and enhancing code readability. Utilize Utility Types: Employ built-in utility types like Partial<T> and Readonly<T> to create flexible and readable type definitions. Comment B bishaldubey Follow 19 Improve B bishaldubey Follow 19 Improve Article Tags : TypeScript JavaScript-Questions TypeScript- DataTypes Explore TypeScript Tutorial 8 min read TypeScript BasicsIntroduction to TypeScript 3 min read Difference between TypeScript and JavaScript 4 min read How to install TypeScript ? 3 min read Hello World in TypeScript 2 min read How to execute TypeScript file using command line? 2 min read Variables in TypeScript 6 min read What are the different keywords to declare variables in TypeScript ? 4 min read Identifiers and Keywords in TypeScript 2 min read TypeScript primitive typesData types in TypeScript 3 min read TypeScript Numbers 4 min read TypeScript String 4 min read Explain the concept of null and its uses in TypeScript 3 min read TypeScript Object typesWhat are TypeScript Interfaces? 4 min read TypeScript class 4 min read How enums works in TypeScript ? 4 min read TypeScript Tuples 4 min read TypeScript other typesWhat is any type, and when to use it in TypeScript ? 3 min read How to Create an Object in TypeScript? 4 min read What is an unknown type and when to use it in TypeScript ? 3 min read Explain the purpose of never type in TypeScript 3 min read TypeScript combining typesTypeScript Union 3 min read What are type aliases and how to create it in Typescript ? 3 min read TypeScript AssertionsExplain Type assertions in TypeScript 3 min read TypeScript FunctionsHow to write a function in Typescript ? 4 min read How to achieve function overloading in TypeScript ? 2 min read Explain the arrow function syntax in TypeScript 2 min read TypeScript toPrecision() Function 1 min read TypeScript toFixed() Function 2 min read TypeScript toLocaleString() Function 2 min read TypeScript toString() 1 min read TypeScript interfaces and aliasesWhat are TypeScript Interfaces? 4 min read What are type aliases and how to create it in Typescript ? 3 min read TypeScript classesHow to Extend an Interface from a class in TypeScript ? 2 min read How to Create an Object in TypeScript? 4 min read How to use getters/setters in TypeScript ? 5 min read TypeScript Inheritance 3 min read When to use interfaces and when to use classes in TypeScript ? 4 min read Generics Interface in typescript 5 min read How to use property decorators in TypeScript ? 4 min read Like