2023-01-03
2639
#typescript#vanilla javascript
Ibiyemi Adewakun
107594
Jan 3, 2023 â‹… 9 min read

18 JavaScript and TypeScript shorthands to know

Ibiyemi Adewakun Ibiyemi is a full-stack developer from Lagos. When she's not writing code, she likes to read, listen to music, and put cute outfits together.

Recent posts:

Glowing 3D cube with the MediaPipe and React logos overlaid, symbolizing integration of AI and web development

How to build better AI apps in React with MediaPipe’s latest APIs

Learn how to integrate MediaPipe’s Tasks API into a React app for fast, in-browser object detection using your webcam.

Emmanuel John
Jul 17, 2025 â‹… 10 min read
Vercel AI SDK logo on a 3D black grid background

How to build unified AI interfaces using the Vercel AI SDK

Integrating AI into modern frontend apps can be messy. This tutorial shows how the Vercel AI SDK simplifies it all, with streaming, multimodal input, and generative UI.

Ikeh Akinyemi
Jul 16, 2025 â‹… 13 min read
how to prepare for a software engineering interview

How to prep for a software dev interview: Advice from a dev leader

Interviewing for a software engineering role? Hear from a senior dev leader on what he looks for in candidates, and how to prepare yourself.

Andrew Evans
Jul 16, 2025 â‹… 12 min read
Next.js Real-Time Video Streaming: HLS.js And Alternatives

Next.js real-time video streaming: HLS.js and alternatives

Set up real-time video streaming in Next.js using HLS.js and alternatives, exploring integration, adaptive streaming, and token-based authentication.

Jude Miracle
Jul 15, 2025 â‹… 19 min read
View all posts

8 Replies to "18 JavaScript and TypeScript shorthands to know"

  1. Hello !

    Thanks you for your article, I learn a lot with it.

    But I think that I found a mistake in short circuit evaluation. When you show the traditional version with if…else statement you use logical && operator but I think you wanted use logical || operator.

    I think that is just a wrting error but i prefer tell it to you.

    Have a good day

    1. I was avoiding using logical OR to make clear the explanation of short circuit evaluation, so the if statement should be confirming “str” has a valid value. I have switched the assignment statements in the condition so it is correct now.

  2. I think there is an error in the renamed variable of destructured object. Shouldn’t the line
    const {x: myVar} = object
    be:
    const {x: myVar} = obj

  3. This code doesn’t work in Typescript?
    // for object literals
    const obj2 = {
    a: 1,
    b: 2,
    c: 3
    }

    for (let keyLetter in obj2) {
    console.log(`key: ${keyLetter} value: ${obj2[keyLetter]}`);

    Gets error:
    error: TS7053 [ERROR]: Element implicitly has an ‘any’ type because expression of type ‘string’ can’t be used to index type ‘{ 0: number; 1: number; 2: number; }’.
    No index signature with a parameter of type ‘string’ was found on type ‘{ 0: number; 1: number; 2: number; }’.
    console.log(`key: ${keyLetter} value: ${obj2[keyLetter]}`);

  4. ~~x is not the same as Math.floor(x) : try it on negative numbers. You’ll find that ~~ is the same as Math.trunc(x) instead.

Leave a Reply