Skip to main content
UploadLanguage (EN)Support
BusinessMobileSocial MediaMarketingTechnologyArt & PhotosCareerDesignEducationPresentations & Public SpeakingGovernment & NonprofitHealthcareInternetLawLeadership & ManagementAutomotiveEngineeringSoftwareRecruiting & HRRetailSalesServicesScienceSmall Business & EntrepreneurshipFoodEnvironmentEconomy & FinanceData & AnalyticsInvestor RelationsSportsSpiritualNews & PoliticsTravelSelf ImprovementReal EstateEntertainment & HumorHealth & MedicineDevices & HardwareLifestyle
JK
Uploaded byJaydeep Kale
276 views

Comprehensive Overview of JavaScript Data Types and Their Usage

Explore JavaScript's primitive and non-primitive data types, including strings, numbers, booleans, objects, arrays, and functions, with examples and the use of the typeof operator.

Technology◦
JavaScript Data Types Prepared By: Kale J. N.
Introduction • What are Data Types? – Define the type of data a variable can hold – JavaScript is dynamically typed Prepared By: Kale J. N.
Two Categories • JavaScript data types are divided into: – 1. Primitive Data Types – 2. Non-Primitive (Reference) Data Types Prepared By: Kale J. N.
Primitive Data Types • - Immutable and hold single values • Types include: – String – Number – Boolean – Undefined – Null – BigInt – Symbol Prepared By: Kale J. N.
String • let name = "Sai"; – Textual data enclosed in quotes – Example: "Hello", 'A', `Backtick` Prepared By: Kale J. N.
Number • let age = 25; • let price = 99.99; • Integers and floating-point • Special values: Infinity, -Infinity, NaN Prepared By: Kale J. N.
Boolean • let isStudent = true; • Only two values: true or false • Used in conditions Prepared By: Kale J. N.
Undefined and Null • let x; // undefined • let y = null; // null • Undefined: declared but not assigned • Null: explicitly no value Prepared By: Kale J. N.
BigInt • let big = 12345678901234567890n; • BigInt: for very large integers Prepared By: Kale J. N.
Non-Primitive Data Types • Hold collections or complex entities • Types: – Object – Array – Function Prepared By: Kale J. N.
Object Example let person = { name: "John", age: 30 }; - Key-value pairs - Mixed data types Prepared By: Kale J. N.
Array Example let fruits = ["Apple", "Banana", "Mango"]; - Ordered list - Can store different types Prepared By: Kale J. N.
Function Example function greet() { return "Hello"; } Prepared By: Kale J. N.
typeof Operator console.log(typeof "Hi"); // string console.log(typeof 123); // number - Used to check data types Prepared By: Kale J. N.