Array declaration syntax in TypeScript: Array<Type>, Type[], and [Type]

In TypeScript, there are three ways to declare an array: Array<Type>, Type[], and [Type]. These might seem like three interchangeable syntaxes for the same thing, but they actually have different meanings and uses.

Array<Type> is a generic type that represents an array of a specific type. The syntax is similar to that of a class, with the type being specified between the angle brackets. This is the recommended way to declare an array in TypeScript, as it is the most explicit and type-safe.

For example, the following code declares a variable list of type Array<string>, which is an array of strings:

let list: Array<string> = ["item1", "item2", "item3"];

Type[] is a shorthand syntax for Array<Type>. It is equivalent to the example above and can be used interchangeably. The following code declares the same variable list as an array of strings, using the Type[] syntax:

let list: string[] = ["item1", "item2", "item3"];

The third syntax [Type]is similar to Type[] in that, it represents an array of a specific type. However, it is actually an alternative way to specify a tuple type.

A tuple is an ordered collection of values, where each value can have a different type. In contrast to an array, a tuple has a fixed length and the types of its elements are known at compile-time. This means that you can access the elements of a tuple using their…