Which Are the Array Data Type?


Angela Bailey

Arrays are an essential data type in programming that allow us to store and organize multiple values under a single variable name. In JavaScript, there are several types of arrays that we can work with. Let’s explore each one of them in detail:

1. Simple or One-dimensional Arrays

A simple or one-dimensional array is the most basic type of array that stores a list of values sequentially.

Each value in the array is assigned a unique index starting from 0. We can access and manipulate these values using their respective index.

To declare a simple array, we use the var keyword followed by the name of the array and square brackets []. For example:

var fruits = ['apple', 'banana', 'orange'];

In this example, we have declared an array named “fruits” containing three elements: ‘apple’, ‘banana’, and ‘orange’.

2. Multi-dimensional Arrays

A multi-dimensional array is an array within an array.

It allows us to store values in multiple dimensions, like rows and columns, creating a tabular structure. It is useful for representing complex data structures such as matrices.

To declare a multi-dimensional array, we use nested square brackets [[]]. For example:

var matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]

In this example, we have declared a 3×3 matrix where each element is accessed using two indices: matrix[row][column].

3. Array of Objects

An array of objects allows us to store multiple objects within an array.

Each object can have its own properties and methods, making it a powerful way to organize related data.

To declare an array of objects, we use the same syntax as a simple array, but instead of primitive values, we assign objects as elements. For example:

var students = [
  { name: 'John', age: 20 },
  { name: 'Jane', age: 22 },
  { name: 'Mark', age: 21 }

In this example, we have declared an array named “students” containing three objects with properties like “name” and “age”. We can access these properties using dot notation or square brackets.

4. Typed Arrays (introduced in ECMAScript 6)

In ECMAScript 6 (ES6) and later versions, JavaScript introduced typed arrays to work with binary data in a more efficient manner.

Typed arrays allow us to store and manipulate large amounts of numerical data as specific types such as integers or floats.

To declare a typed array, we use the constructor syntax followed by the desired type and the number of elements. For example:

var intArray = new Int32Array(5);

In this example, we have declared a typed array named “intArray” with a length of 5 elements, each element being a 32-bit signed integer.


Understanding the different types of arrays in JavaScript is crucial for efficient data manipulation and organization. Whether it’s a simple array, multi-dimensional array, array of objects, or typed arrays, each type has its own unique purpose and functionality. By utilizing these array types effectively, you can create more robust and flexible programs.

I hope this article has provided you with a comprehensive understanding of the various array data types in JavaScript. Happy coding!

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