Var lastName = "Simple Snippets" // String Creating Variable in JavaScript – var length = 5 // Number We will learn more about these in future tutorial articles. Represents instance through which we can access members ![]() Var flag2 = false JavaScript Non-Primitive/Composite Data Types – Data Type Var z = 123e-5 // 0.00123 JavaScript Booleans –īooleans can only have two values: true or false. Booleans are often used in conditional testing. Numbers can be written with, or without decimals: var x1 = 34.00 // Written with decimalsĮxtra large or extra small numbers can be written with scientific (exponential) notation: var y = 123e5 // 12300000 ![]() Var answer = 'He is called "Mark"' // Double quotes inside single quotes JavaScript Numbers – Var answer = "He is called 'Mark'" // Single quotes inside double quotes ![]() You can use quotes inside a string, as long as they don’t match the quotes surrounding the string: var answer = "It's alright" // Single quote inside double quotes Var carName = 'BMW' // Using single quotes You can use single or double quotes: var carName = "Mercedes" // Using double quotes Represents boolean value either false or trueĪ string (or a text string) is a series of characters like “Simple Snippets”. JavaScript Primitive Data Types – Data Type There are two types of data types in JavaScript.(as shown in the diagram above) JavaScript provides different data types to hold different types of values. numbers(1, 2, 5,5), string(“hello Simple Snippets”, “JS”), boolean(true, false) etc.įollowing are the different Data Types in JavaScript – In programming, a variable is a value that can be changed depending on the conditions or information being passed to the program.ĭatatypes are basically type of data that can be used and manipulated in a program. ![]() Variables are used to store information to be referenced & manipulated in a computer program.A variable provides us with a named storage that our programs can manipulate. It is the basic unit of storage in a program.Variables –įollowing are some basic definitions of variables in a typical programming language context. Strings in JavaScript are primitive data types and immutable, which means they are unchanging.// Storing a String in a Variable const newString = "This is a string assigned to a variable.In this tutorial post we will study and understand the concept of Variables & Data Types in JavaScript. After you complete a statement (sentence), end it with a " " character. When defining string values ("this is a string of characters"), single (') and double (") quotes are interchangeable, as long as the closing matches the opening.Parentheses are used for 2 reasons:Checking equality (evaluating 2 or more items to simply "true" or 'false') Sending or receiving a value if (stringA = stringa)Manipulating StringsA string is a sequence of one or more characters that may consist of letters, numbers, or symbols. Node JS Tutorial By KnowledgeHut JavaScript is a high-level, object-based, dynamic scripting language popular as a tool for making web pages interactive.Basic need-to-knowEVERYTHING is case-sensitivevar stringA = "String A" var stringa = "String a" alert(stringA = stringa) // falseSemicolons are JavaScript's equivalent of a period.
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