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JavaScript Tutorial

JavaScript Data Types

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Every programming language is designed around storing information for your application or website. When storing this information, there is always a need to specify what kind of information is being stored. It could be numerical information or textual data. Sometimes it could be a logical state and sometimes it is a collection or list of information. Hence, every programming language ships with built-in data types also known as primitive data types.

JavaScript as a language provides following primitive data types:

  • Number
  • String
  • Boolean
  • Null
  • Undefined
  • BigInt
  • Symbol

On top of these built-in primitive data types, JavaScript also provides following data types that can be used by combining one or more primitive types.

  • Objects
  • Arrays

Dynamic and Weakly Typed Language

It is important to note that JavaScript is a dynamic and weakly typed language. By that, it means that a variable assigned a value of certain type can be re-assigned a value of different type.

```
let response = ‘Success’;
console.log(response); // prints ‘Success’

response = true;
console.log(response); // prints true
```

Typeof Operator

Considering JavaScript is a weakly-typed, dynamic language, it also provides Developers with typeof operator that helps to understand the data type being stored in a certain variable at any given point in time.

```
const grade = 100;
console.log(typeof grade); // prints number

const greeting = ‘Merry Christmas’;
console.log(typeof greeting); // prints string

const hasGraduated = true;
console.log(typeof hasGraduated); // prints boolean
```

JavaScript String Length

Sometimes while using strings in JavaScript, there is a need to know the length of the string or textual information stored in a variable. JavaScript provides length property for the same. length property is commonly used when there is a need to find the length of a string or many other data types in JavaScript.

```
const greeting = ‘Merry Christmas’;
console.log(greeting.length); // prints 15;
```
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