Organizing Array Elements in Sequence with Various Data Types Using Typescript

Question

Organizing Array Elements in Sequence with Various Data Types Using Typescript

I'm working with an array that contains various data types - String, Number, and Boolean. My goal is to ensure that these elements are present in the array in a specific order. Here is how my array looks:

const idList: (String| Number | Boolean )[] = ["someStringId1","someStringId2", 01, 09, true, false];

Although I've already used Type annotation to allow for any String, Number, or Boolean, I need to figure out how to restrict it so that only String, Number, and Boolean appear in that exact order.

typescript

Answer 1

Answer №1

Using a tuple is essential in TypeScript as it acts like a specialized array that can only hold a specific number of items and each item must be of a predefined type:

type MyTuple = [string, number, boolean];

const validTuple: MyTuple = ["hello", 42, true];

const invalidTuple1: MyTuple = ["hello", "42", "true"];
const invalidTuple2: MyTuple = ["hello", 42, true, "world"];
const invalidTuple3: MyTuple = ["hello", 42];

Test your understanding with the TypeScript Playground

Answer 2

Using a tuple is essential in TypeScript as it acts like a specialized array that can only hold a specific number of items and each item must be of a predefined type:

type MyTuple = [string, number, boolean];

const validTuple: MyTuple = ["hello", 42, true];

const invalidTuple1: MyTuple = ["hello", "42", "true"];
const invalidTuple2: MyTuple = ["hello", 42, true, "world"];
const invalidTuple3: MyTuple = ["hello", 42];

Test your understanding with the TypeScript Playground

Organizing Array Elements in Sequence with Various Data Types Using Typescript

Answer №1

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