Anastasia Zotova

I wrote this blog while attending the Hack Reactor coding bootcamp in 2014-15. Most of the posts in this blog are detailed solutions to the Perfection Kills JavaScript quiz.

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13. Finally, we've reached the last question of the Perfection Kills Quiz. 14) with (function(x, undefined){}) length;Correct answer: 2. To answer this question,

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. 13) function f(){ return f; } new f() instanceof f;Correct answer: false. In this snippet of code, the instanceof operator checks whether the left operand

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. 12) (function f(){ function f(){ return 1; } return f(); function f(){ return 2; } })();Correct answer: 2. For simplicity, I will refer to the "outer" function function

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. 11) (function(foo){ return typeof foo.bar; })({ foo: { bar: 1 } });Correct answer: "undefined". This is also one of the easier questions of the quiz. The anonymous function

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8, 9. 10) var x = [typeof x, typeof y][1]; typeof typeof x;Correct answer: "string". Compared to other questions in the quiz, this is a relatively easy one. Let's

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7, 8. 9) var x = 1; if (function f(){}) { x += typeof f; } x;Correct answer: "1undefined". This question is closely related to question 2 from the same quiz. First of all,

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6, 7. 8) var f = (function f(){ return "1"; }, function g(){ return 2; })(); typeof f;Correct answer: "number". In order to understand this snippet of code, we have to look into the

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5, 6. 7) var foo = { bar: function(){ return this.baz; }, baz: 1 } typeof (f = foo.bar)();Correct answer: "undefined". This question is very similar to the previous one (see part 6). First, let's

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4, 5. 6) var foo = { bar: function(){ return this.baz; }, baz: 1 }; (function(){ return typeof arguments[0](); })(foo.bar);Correct answer: "undefined". For simplicity, I will refer to the function function(){ return this.baz;

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3, 4. 5) (function f(f){ return typeof f(); })(function(){ return 1; });Correct answer: "number". The function f(f) {return typeof f();} is immediately invoked with the argument function(){ return 1; }. The expression function f(

Previous posts on Perfection Kills JavaScript quiz: 1, 2, 3. 4) var y = 1, x = y = typeof x; x;Correct answer: "undefined". The '=' operator in JavaScript has right associativity, which means that x = y = typeof x is equivalent to x = (y = typeof

Previous posts on Perfection Kills JavaScript quiz: 1, 2. 3) (function(x){ delete x; return x; })(1);Correct answer: 1. The line of code delete x; does not actually delete x, so the immediately invoked function returns the value of x, i.e. 1.

Let's continue to explore the 'Perfection Kills' quiz. 2) var f = function g(){ return 23; }; typeof g();Correct answer: error. There are two common ways two define a function in JavaScript. i) With a function expression that is assigned to a variable. In this

Recently I took the 'Perfection Kills' JavaScript quiz (http://perfectionkills.com/javascript-quiz/) and found it quite insightful. I thought it would be interesting to go through the solution to some of the quiz problems. Attention: spoilers ahead. All the questions are structured in the

If you have limited deployment experience and are deploying to Azure for the first time, you might encounter some common problems. Here I describe a few required steps and troubleshooting practices for deploying a node application to Azure. I assume that you have already

Hi! My name is Anastasia. Currently I am studying at Hack Reactor. In this blog I am going to write about the transition from economics and business to software development, tech startups, and all the things related to programming that I found useful or