ReactJS experience test

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Do you think the package-lock.json file is important in our project?

Have you done any project that allow users to chat or call with each other?

What is the output of this script

for(var i=0; i<=3; i++) {

    setTimeout(function() {
        console.log(i)
    }, 0)
}

Do you think TypeScript is better than JavaScript?

Do you have experience writing unit test in React.JS project?

Do you think static typing (like TypeScript) is necessary for large-scale project? Why or why not?

Have you contributed to open source project? If yes, list the project below

What is Virtual DOM? How does Virtual DOM help optimize React.JS performance?

Did you use functional component? When do you prefer to use functional component over class-based component in React.JS?

Do you know circular reference? Can circular reference cause memory leak in javascript application? Why or why not?