From f6286fe37c57ef8a0bfe467421990615950c3a16 Mon Sep 17 00:00:00 2001 From: roblarsen Date: Tue, 23 Apr 2024 16:58:45 +0000 Subject: [PATCH] deploy: df72899a976bd49736c6cb14d0826cd21ad59758 --- questions/javascript-questions/index.html | 2 +- sitemap.xml | 96 +++++++++++------------ 2 files changed, 49 insertions(+), 49 deletions(-) diff --git a/questions/javascript-questions/index.html b/questions/javascript-questions/index.html index 1d66d51..04a4e16 100644 --- a/questions/javascript-questions/index.html +++ b/questions/javascript-questions/index.html @@ -1,2 +1,2 @@ -JavaScript Questions ★ Front-end Developer Interview Questions

JavaScript Questions

  • Explain event delegation.
  • Explain how this works in JavaScript.
    • Can you give an example of one of the ways that working with this has changed in ES6?
  • Explain how prototypal inheritance works.
  • What is the difference between a variable that is: null, undefined or undeclared?
    • How would you go about checking for any of these states?
  • 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?
  • 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()?
  • Explain the differences on the usage of foo between function foo() {} and var foo = function() {}
  • Can you explain what Function.call and Function.apply do? What is the notable difference between the two?
  • Explain Function.prototype.bind.
  • What is the difference between feature detection, feature inference, and using the UA string?
  • Explain “hoisting”.
  • What is type coercion? What are common pitfalls of relying on type coercion in JavaScript code?
  • Describe event bubbling.
  • Describe event capturing.
  • What is the difference between an “attribute” and a “property”?
  • What are the pros and cons of extending built-in JavaScript objects?
  • What is the difference between == and ===?
  • Explain the same-origin policy with regards to JavaScript.
  • Why is it called a Ternary operator, what does the word “Ternary” indicate?
  • What is strict mode? What are some of the advantages/disadvantages of using it?
  • What are some of the advantages/disadvantages of writing JavaScript code in a language that compiles to JavaScript?
  • What tools and techniques do you use debugging JavaScript code?
  • Explain the difference between mutable and immutable objects.
    • What is an example of an immutable object in JavaScript?
    • What are the pros and cons of immutability?
    • How can you achieve immutability in your own code?
  • Explain the difference between synchronous and asynchronous functions.
  • 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?
  • 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?
  • What is the definition of a higher-order function?
  • Can you give an example for destructuring an object or an array?
  • Can you give an example of generating a string with ES6 Template Literals?
  • Can you give an example of a curry function and why this syntax offers an advantage?
  • What are the benefits of using spread syntax and how is it different from rest syntax?
  • How can you share code between files?
  • Why you might want to create static class members?
  • 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.

Coding questions

  • Make this work:
duplicate([1,2,3,4,5]); // [1,2,3,4,5,1,2,3,4,5]
  • Create a for loop that iterates up to 100 while outputting “fizz” at multiples of 3, “buzz” at multiples of 5 and “fizzbuzz” at multiples of 3 and 5
  • What will be returned by each of these?
console.log("hello" || "world")
+JavaScript Questions ★ Front-end Developer Interview Questions
JavaScript Questions
  • Explain event delegation.
  • Explain how this works in JavaScript.
    • Can you give an example of one of the ways that working with this has changed in ES6?
  • Explain how prototypal inheritance works.
  • What is the difference between a variable that is: null, undefined or undeclared?
    • How would you go about checking for any of these states?
  • 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()?
  • Explain the differences on the usage of foo between function foo() {} and var foo = function() {}
  • Can you explain what Function.call and Function.apply do? What is the notable difference between the two?
  • Explain Function.prototype.bind.
  • What is the difference between feature detection, feature inference, and using the UA string?
  • Explain “hoisting”.
  • What is type coercion? What are common pitfalls of relying on type coercion in JavaScript code?
  • Describe event bubbling.
  • Describe event capturing.
  • What is the difference between an “attribute” and a “property”?
  • What are the pros and cons of extending built-in JavaScript objects?
  • What is the difference between == and ===?
  • Explain the same-origin policy with regards to JavaScript.
  • Why is it called a Ternary operator, what does the word “Ternary” indicate?
  • What is strict mode? What are some of the advantages/disadvantages of using it?
  • What are some of the advantages/disadvantages of writing JavaScript code in a language that compiles to JavaScript?
  • What tools and techniques do you use debugging JavaScript code?
  • Explain the difference between mutable and immutable objects.
    • What is an example of an immutable object in JavaScript?
    • What are the pros and cons of immutability?
    • How can you achieve immutability in your own code?
  • Explain the difference between synchronous and asynchronous functions.
  • 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?
  • What is the definition of a higher-order function?
  • Can you give an example for destructuring an object or an array?
  • Can you give an example of generating a string with ES6 Template Literals?
  • Can you give an example of a curry function and why this syntax offers an advantage?
  • What are the benefits of using spread syntax and how is it different from rest syntax?
  • How can you share code between files?
  • Why you might want to create static class members?
  • 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:
duplicate([1,2,3,4,5]); // [1,2,3,4,5,1,2,3,4,5]
  • Create a for loop that iterates up to 100 while outputting “fizz” at multiples of 3, “buzz” at multiples of 5 and “fizzbuzz” at multiples of 3 and 5
  • What will be returned by each of these?
console.log("hello" || "world")
 console.log("foo" && "bar")
  • Write an immediately invoked function expression (IIFE)
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