Array

An array is a linear data structure that stores a collection of elements of the same data type. Arrays are used to store multiple values in a single variable, rather than declaring separate variables for each value.

In most programming languages, including TypeScript, arrays are zero-based, meaning that the first element of the array has an index of 0. You can access the elements of an array using their indices, which start at 0 for the first element and increment by 1 for each subsequent element.

For example, if you have an array called numbers that stores the elements 1, 2, 3, 4, and 5, you can access the first element of the array using numbers[0], the second element using numbers[1], and so on.

You can also use the length property of an array to determine the number of elements in the array. For example, if numbers is an array with 5 elements, numbers.length would return 5.

Arrays are useful for storing and organising data when you need to store multiple values that are related to each other, such as a list of student names or a list of account balances. They can be used to store elements of any data type, including numbers, strings, and objects.

Example in TypeScript

let array: number[] = [1, 2, 3, 4, 5];
let array: Array<number> = [1, 2, 3, 4, 5];