Tuples In TypeScript

In TypeScript, a tuple is a finite ordered list of elements with a specific type.

Tuples allow us to express an array where the type of a fixed number of elements is known, but need not be the same.

Type Safety: Typescript ensures that the types of values on specific position of the tuple are consistent with the types defined when the tuple was declared.

Fixed Length: Once a Tuple is defined, the length of a tuple cannot be changed.

Accessing Elements: We can access elements in a tuple using their index value, similar to arrays.

Mixed Types: Tuples allow us to mix various types of values, providing flexibility in how we can structure our data.

They combine elements of different types in a specific order.

Tuple Declaration:

let declaredTuple: [string, number, boolean];

Note: This declares a tuple named `declaredTuple` that can hold three values: a string, a number, and a boolean, in that order.

Tuple Initialization:

let declaredTuple: [string, number, boolean];

declaredTuple = ["Hi", 22, false];

Here, the tuple is initialized with values that match the specified types and order.

Accessing Tuple Elements:

let declaredTuple: [string, number, boolean];

declaredTuple = ["Hi", 22, false];

let greeting: string = declaredTuple[0];
let age: number = declaredTuple[1];
let isActive: boolean = declaredTuple[2];

We can access individual elements in a tuple using their respective indices.

Tuple Type Inference:

TypeScript can infer tuple types based on the assigned values.

Example:

let anotherTuple = ["Hi", 22, false]; // TypeScript infers the tuple type as [string, number, boolean]

Tuple with Optional Elements:

Example:

let optionalTuple: [string, number?];

optionalTuple = ["Hello"];
optionalTuple = ["Hello", 42];

We can make elements in a tuple optional by using the ? notation.

Example:

let readonlyTuple: readonly [string, number] = ["Readonly", 1234];
// readonlyTuple[0] = "Updated";  // Error: Cannot assign to '0' because it is a read-only property

Readonly Tuples:

Example:

let [first, ...rest] = [1, 2, 3, 4, 5, 6, 7];
console.log(first);  // Output: 1
console.log(rest);   // Output: [2, 3, 4, 5, 6, 7]

We can make a tuple readonly to prevent modifications.

Rest Elements in Tuples:

We can use the rest (we can replace the `rest` variable with any other variable ) using syntax (...) to capture the remaining elements of a tuple.

Note:

In Typescript, Tuples provide a way to work with fixed-size collections of heterogeneous data while maintaining type safety when assigning elements.

<-- Array

Enum -->

Tuples In TypeScript

In TypeScript, a tuple is a finite ordered list of elements with a specific type.

Tuples allow us to express an array where the type of a fixed number of elements is known, but need not be the same.

Type Safety: Typescript ensures that the types of values on specific position of the tuple are consistent with the types defined when the tuple was declared.

Fixed Length: Once a Tuple is defined, the length of a tuple cannot be changed.

Accessing Elements: We can access elements in a tuple using their index value, similar to arrays.

Mixed Types: Tuples allow us to mix various types of values, providing flexibility in how we can structure our data.

They combine elements of different types in a specific order.

Tuple Declaration:

let declaredTuple: [string, number, boolean];

Note: This declares a tuple named `declaredTuple` that can hold three values: a string, a number, and a boolean, in that order.

Tuple Initialization:

let declaredTuple: [string, number, boolean];

declaredTuple = ["Hi", 22, false];

Here, the tuple is initialized with values that match the specified types and order.

Accessing Tuple Elements:

let declaredTuple: [string, number, boolean];

declaredTuple = ["Hi", 22, false];

let greeting: string = declaredTuple[0];
let age: number = declaredTuple[1];
let isActive: boolean = declaredTuple[2];

We can access individual elements in a tuple using their respective indices.

Tuple Type Inference:

TypeScript can infer tuple types based on the assigned values.

Example:

let anotherTuple = ["Hi", 22, false]; // TypeScript infers the tuple type as [string, number, boolean]

Tuple with Optional Elements:

Example:

let optionalTuple: [string, number?];

optionalTuple = ["Hello"];
optionalTuple = ["Hello", 42];

We can make elements in a tuple optional by using the ? notation.

Example:

let readonlyTuple: readonly [string, number] = ["Readonly", 1234];
// readonlyTuple[0] = "Updated";  // Error: Cannot assign to '0' because it is a read-only property

Readonly Tuples:

Example:

let [first, ...rest] = [1, 2, 3, 4, 5, 6, 7];
console.log(first);  // Output: 1
console.log(rest);   // Output: [2, 3, 4, 5, 6, 7]

We can make a tuple readonly to prevent modifications.

Rest Elements in Tuples:

We can use the rest (we can replace the `rest` variable with any other variable ) using syntax (...) to capture the remaining elements of a tuple.

Note:

In Typescript, Tuples provide a way to work with fixed-size collections of heterogeneous data while maintaining type safety when assigning elements.

<-- Array

Enum -->