Four typical Front-End Developer Interview Questions

Eli Kantor
Jun 26 · 2 min read
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Photo by Karl Pawlowicz from Unsplash

Below are four front-end interview questions along with potential answers. Comments and questions are welcome!

1. Discuss the use cases of the JSON.stringify() and JSON.parse() methods

JSON methods are used to efficiently transmitting data over a network by converting a complex object into a string when sending (JSON.stringify()) and by converting the string back to an object upon receipt (JSON.parse()). For example…

let obj = {
name: "Bob",
age: "60",
hometown: "Boston"
}
let json = JSON.stringify(obj)typeof json // "string"console.log(json)
/*
"{
"name": "Bob"
"age": "60"
"hometown": "Boston"
}"
*/
console.log(JSON.parse(json))
/*
{
name: "Bob"
age: "60"
hometown: "Boston"
}
*/

2. What are the pros of using xUnit test style framework assertion methods instead of built-in assert statements?

  • xUnit assertions offer a richer API than built-in assert statements

3. What are the following types of testing and why are they used: integration, mutation, branch coverage, fuzzing?

  • Integration tests are tests done on groups of software modules after unit testing has been successful on each individual module.

4. What are Webpack and Babel and how are they used?

  • Webpack is an open-source Javascript module bundler that can take modules with dependencies and create static assets representing the modules. In addition to Javascript modules, it can also transform HTML and CSS files.

JavaScript In Plain English

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