TypeScript: Tuple Examples

July 29, 2022 Augustus

In TypeScript, a tuple is a specific type of array which has the following characteristics: The number and order of elements are fixed and must be adhered The type of each element is predefined and strict…

VS Code: Set Preferred Quote Type for Quick Fixes

July 27, 2022 A Goodman

When working with Javascript and TypeScript, arbitrary use of single quotes and double quotes may not cause errors but will result in a lack of consistency and readability. Therefore, choosing and going with a certain quote…

TypeScript: Object with Optional Properties

April 10, 2022 Pennywise

In TypeScript, you can specify that some or all properties of an object are optional. To do so, just add a question mark (?) after the property name. Example: Output: Further reading: TypeScript: Using Variables to…

TypeScript: Using Variables to Set Object Keys

March 20, 2022 Hadrianus

There might be cases where you want to use a variable as a dynamic key of an object in TypeScript. The following examples will show you how to do that. Example 1 Output: Example 2 Output:…

Using Rest Parameters in TypeScript Functions

November 17, 2021 A Goodman

In TypeScript, you can use the spread operator (…) as the final parameter of a function. All of the arguments (except the ones that were explicitly declared before the three dots) passed to that function will…

TypeScript: Function with Optional and Default Parameters

November 17, 2021 A Goodman

In TypeScript, a function can have optional and default parameters. In order to make a parameter optional, we can postfix it with a question mark (?). We can provide a default value to a parameter by…

Calculate Variance and Standard Deviation in Javascript

November 15, 2021 Napoleon

This short article shows you how to calculate the variance and standard deviation of a given array of numbers. You will see the code in vanilla Javascript and TypeScript. Javascript Output: TypeScript If you use TypeScript…

Javascript: Capitalize the First Letter of Each Word (Title Case)

November 9, 2021 A Goodman

This short article shows you how to capitalize the first letter of each word in a string. hypothetical inputs and expected outputs: we will just capitalize the first letter of a word and keep the rest…

Express + TypeScript: Extending Request and Response objects

July 12, 2022 Augustus

This article shows you how to add new properties to an Express request object (we often deal with this task when working with middleware) or an Express response (not too common but may be necessary in…

React + TypeScript: Working with Radio Button Groups

June 8, 2022 A Goodman

The end-to-end example below covers the most important aspects you need to know when working with radio button groups in a React application written in TypeScript. We will write code from scratch and use the modern…

React + TypeScript: Making a Custom Context Menu

June 8, 2022 A Goodman

This article walks you through an end-to-end example of creating a custom context menu in a React app that is written in TypeScript. We’ll use new features of React like hooks and functional components. You won’t…

React + TypeScript: Multiple Select example

June 8, 2022 A Goodman

The example below describes how to use a multiple select in a React project written in TypeScript. You will learn to get the selected values as well as display them on the screen. Everything will be…

1 2 3