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add js questions

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src/questions/javascript-questions.md
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* What is a closure, and how/why would you use one?
* What language constructions do you use for iterating over object properties and array items?
* Can you describe the main difference between the `Array.forEach()` loop and `Array.map()` methods and why you would pick one versus the other?
* Сan you describe other popular methods for iterating over arrays?
* What is a typical use case for anonymous functions?
* What is the difference between host objects and native objects?
* Explain the difference between: `function Person(){}`, `var person = Person()`, and `var person = new Person()`?
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* What is event loop?
* What is the difference between call stack and task queue?
* What are the differences between variables created using `let`, `var` or `const`?
* Can you change a property of an object defined via `const`? How you can change this behavior?
* What are the differences between ES6 class and ES5 function constructors?
* Can you offer a use case for the new arrow `=>` function syntax? How does this new syntax differ from other functions?
* What advantage is there for using the arrow syntax for a method in a constructor?
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* What is the difference between `while` and `do-while` loops in JavaScript?
* What is a promise? Where and how would you use promise?
* Discuss how you might use Object Oriented Programming principles when coding with JavaScript.
* What is the difference between `event.target` and `event.currentTarget`?
* What is the difference between `event.preventDefault()` and `event.stopPropagation()`?
## Coding questions
* Make this work: