Yes, it can be true, and there are 6 ways — amazing! — Recently, I was asked a very interesting interview question: Can (a== 1 && a==2 && a==3) ever evaluate to true in JavaScript?. I almost lost the job opportunity because I couldn’t answer. At that moment, I was shocked by the question and thought the interviewer was joking.

An interview experience that made me so sad. — This is an interview experience that happened to my friend not long ago. The interviewer wanted him to implement the Promise.all function. Unfortunately, my friend didn't play well on the spot and couldn't answer the question. After the interview, the interviewer rudely said to him: “Your foundation of JavaScript is…

Do you only use React? Do you know Vue? — Recently, my friend failed an interview simply because she was not familiar with Vue.js. She usually uses React most of the time at work, so she didn’t bother to learn about other front-end frameworks. Should we be familiar with all the front-end frameworks in the world? No, that is extremely…

A secret that most people don’t know. — Preface Recently, I participated in an interview that made a deep impression on me. After many twists and turns, I finally got the offer. You can’t imagine what I went through. 1. My interview process Interviewer： Please tell me what happened when “npm run xxx”? The more detailed the better. Me： I thought to myself…

4 very useful React tips. — 1. Don’t forget to remove the listener when the component is Unmounting. We often need to listen to keyboard events, mouse events, etc. in useEffect of React. But we often forget to remove them. const windowScroll = () => { console.log('scroll') } useEffect(() => { window.addEventListener("scroll", windowScroll, false) }, []) Yes, when we return to this component, the scroll event will be…

Use them to create a great user experience As a front-end developer engineer, we often need to make cool animation effects. You know, that’s very interesting. In this article, I want to share with you 10 animation libraries that can greatly improve our work efficiency and through which we can…

A list of one-liners you should know to up your knowledge of JavaScript. — In just a few minutes, step up your JS knowledge. 1. Generate a random string We can use Math.random to generate a random string, it’s very convenient when we need a unique ID. const randomString = () => Math.random().toString(36).slice(2) randomString() // gi1qtdego0b randomString() // f3qixv40mot randomString() // eeelv1pm3ja

1.# Render a list using the number 0 and “&&” as conditions Problem Description Maybe you have written code like this where we need to render a list, but before that, we often used array.length and && symbols to decide whether to render the list or not. const renderList = () => { const [ dataList, setDataList ] = useState([]) …

Do you only use React? Do you know Vue? — Recently, my friend failed an interview simply because she was not familiar with Vue.js. She usually uses React most of the time at work, so she didn’t bother to learn about other front-end frameworks. Should we be familiar with all the front-end frameworks in the world? No, that is extremely…