Array<Type> vs Type[] vs [Type] in TypeScript

There are a lot of ways to define array in TypeScript. But when we can use it 🤔? There is no specific rules to use but we can see the differences.

• Array<Type> : It is same as Type[] but is preferred when using different types in the array. Ex

const firstArray:Array<string|number> = [1,2,'alpha'];

• Type[] : It is a simple array of a single type. Ex

const secondArray:string[] = ['alpha','beta','gama'];

• [Type] : It is a way of defining a tuple, a fixed size array. Ex

const thirdArray:[string, number] = ['alpha', 21];

Where we should use the different array formats.

Well it is quite simple to follow.

• When you are having a single datatype and length is unknown then type[] can be used.
• When the datatype and length both are unknown Array<type | type> can be used.
• When there is very small size array with specific datatype in each position then Tuple can be used [string, number].

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Rahul RajFollow

I am a developer who is trying to improve myself day by day.