Array Declaration

// literal
let fruits: string[] = ['Apple', 'Orange', 'Banana'];

// generics
let fruits: Array<string> = ['Apple', 'Orange', 'Banana'];

[string] vs string[]

Differences

• [string] is a tuple
• string[] is an array of strings

What is Tuple

Tuple types allow you to express an array with a fixed number of elements whose types are known, but need not be the same

// Declare a tuple type
let x: [string, number];

// Initialize it
x = ["hello", 10]; // OK

// Initialize it incorrectly
x = [10, "hello"]; // Error

// Error: Tuple type '[string, number]' of length '2' has no element at index '3'.
x[3] = "world";