So, it simply means you cannot modify a string once it is created. In JavaScript, there are the following primitive data types: Number—this includes floating point numbers as well as integers, for example 1, 100, 3.14. Non-primitive types are created by the programmer and is not defined by Java (except for String). Non-primitive data types are called reference types because they refer to objects. It can hold any type of values such as numbers, strings etc. But a function has its roots in the so-called Object prototype, so even though it’s its own thing, it still falls under the object umbrella. undefined is also one of the primitive types and it contains a special value undefined. Datatypes hold different values. Yes, it’s annoying with all those synonyms, but you must be aware of them. Also we can say that is a grouping of same or different data items. What you’ve uncovered, are all the different property types that regular objects and arrays (a type of object) contain respectively. Understanding the above code snippet below is the table and with the help of this table, you can easily understand the outputs of the above code snippet. Read More: Binary Trees and Different Types. JavaScript includes primitive and non-primitive data types as per latest ECMAScript 5.1. In JavaScript, objects and functions are considered non-primitive values. It is little bit complicated as it is derived from primitive data structures. First is using the dot notation (.) And we see that there is nested object exist in employeeDetail object. The typeof operator can return one of these primitive types: string Why the above code snippet gives us NaN. and second is array-like notation ( [ ] ). For example, the data type for values 300, 20.50, 10001 and 13456.89 is number. If we perform any operation using NaN, then it always returns NaN. Below is the example which shows how to access the object properties using dot notation. So, a literal string begins and ends with either with the single quote( ‘ ) or double quotes ( ” ). All other types are called “primitive” because their values can contain only a single thing (be it a string or a number or whatever). JavaScript has 5 primitive data types that are passed by value, they are Boolean, NULL, undefined, String, and Number. Any value that you use is of a certain type. What is the new addition in ES6 in terms of data types? The same variable in JavaScript able to handle different values at any time in JavaScript code. For example 10.00. Below is the code snippet to explain this: It is also important to understand what conclusion is of the null vs. undefined. So, when we declare a variable and do not initialize it then the undefined value is assigned to that variable. When declaring a variable, you are generally creating a potential new address. — — Prerequisites — Types & Data Structures Basics — — Does JS have types? Well, look at the screenshot from earlier again: It says that the function has both a function prototype and an Object prototype. The symbol is a primitive which cannot be recreated. Because in the above code snippet you divide the string value with the number which is an invalid operation. Below is the example: In the above code snippet first, we declare a variable language and initialize it to the string of value “JavaScript”. Non-primitive are also called reference types meaning the identifier has a reference to a location in memory which stores the variable. Primitive, Non-Primitive Data Types in JavaScript | Examples, Number and Boolean Data Types In JavaScript | Codez Up, Understanding Javascript String with Example | Codez Up, Basics of Go | Variables | Import-Export | Pointers, Simple and Basic Spring Security Project Example, Standard Operating Procedures (SOP) Documents | Software Engineering, Introduction to Spring Security in Spring | Spring Boot. This is the basic information about the object type. A primitive data value is a single simple data value with no additional properties and methods. Classes. Below is the code snippet for the same: It is very important to discuss the NaN because here we are discussing numbers data type in JavaScript. Below is the table which helps you to understand the conversion rule: The symbol is the newest primitive type added in ES6. There are two interesting characteristics of the NaN: Below is the coding snippet which explains above two characteristics: The next data type is the string data type. Try running the typeof operator on your function and see what happens: If everything in JavaScript is an object, why does it output function as the type? Summary . Try printing out the following in your console: If you’re using Chrome, you probably won’t get an expandable output — I don’t know why Google/Chrome designed it like this. We can click and expand on these outputs. In JavaScript, objects and functions are considered non-primitive values. The next data type is boolean and boolean simply means either true or false. Let’s understand its working with the help of an example. In contrast, objects are used to store collections of data and more complex entities. 6. Thanks for reading. Now it probably makes more sense to you why I mentioned earlier that non-primitives are sometimes referred to as object references. Hence Null is an object value whereas undefined is value as well as type also. Number : To store a variable that holds a numeric value, the primitive data type number is used. An object is a collection of properties and each property is defined as a key-value pair. So that’s why it gives us NaN which means invalid number. In other words, the same variable can hold values of different types at any time. In case you want to learn it in detail you can visit what is an object in JavaScript. JavaScript gives non-primitive data type Object, to implement this. And officeAddress is also an object which contains properties area, city, state, and country. Java primitive data types are the ones which are predefined by the programming language which in this case is Java. JavaScript always passes by value, but in an array or object, the value is a reference to it, so you can ‘change’ the data. They are also called “reference variables” or “object references” since they reference a memory location which stores the data. 1. The first is called Object, the second is called Array. So, a variable is said to be ‘undefined’ if it is declared but we cannot initialize or assign any value to it. So, we can say that variable that contains null has type object. However, its value does. The key of a property is a string or a symbol and should be a legal identifier. log ( arr ) // Output -> [ 'ONE', 'two', 'three' ] Below is the example of an empty object with object literal form: Below is the example in which we define a car object with three properties: The property name of an object can be any string. Tagged with javascript, beginners, programming. When a data type/value is primitive, all it means is, that the value is immutable. But the symbol change is absolutely unique. Non-primitive type: The data is said to be non-primitive if it is a collection of multiple values. Introduction to Go Language and What is it good for? Wait, why does it say prototype: Object? Javascript provides six primitive types - number, boolean, string, null, undefined and symbol. The above code snippet gives us undefined because experience property is not existing in the employeeDetail object. 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