techtest.md

JS technical test

Starter

• Do you know anything about HOD? GDS/etc — can give quick introduction
• What have you been working on recently? Good things/bad things?
• Familiar with agile? How have you been working with your team?

What don't you like about:

• JS/angular/backbone/ember
• Node.js
• Mysql/postgre
• NoSQL store
• other technology

Git

• What does a good commit message look like to you?
• What is a merge commit?
• Your feature branch has fallen behind the master branch, how do you update your branch?

Assume you have commits pushed to origin:ABCDEF

• You discover another developer put a password in C, discuss how you could go about editing that commit
• You find it would make more semantic sense to reorder the commits to AEBCF
• You find it would make more semantic sense to combine commits A & B Assume have another branch with commits: WXYZ
• You want to take commit Y and add it after E

Scope

Consider the following code:

var a = b = 5;
console.log(b);

What will be printed on the console?

Hoisting

Describe what the following will return and why

function bar() {
   console.log(a);
   console.log(foo());
   var a = 1;
   function foo() {
      return 2;
   }
}
bar();

Flow

Describe the predicted output of, and why

console.log("john");
setTimeout(function() {
    console.log("jack");
}, 0);
console.log("jake");

Extend basic prototypes

Write javascript to make the following:

console.log('helloworld'.repeatit(3));

output: helloworldhelloworldhelloworld

Quickfire

• Describe the difference between == and ===
• Assuming function myfunc() {} describe the difference between myfunc() myfunc.call() and myfunc.apply()
• Describe the difference between null and undefined
• What is an error-first callback?
• How can you avoid callback hells?
• How can you listen on port 80 with Node?
• What's the event loop?
• What's the difference between operational and programmer errors?

Discussion points

• AWS/rackspace/similar cloud
• NoSQL stores
• Docker
• Technology you're excited about
• Mysql when would you use INNODB vs MYSIAM
• Talk about what HTTP methods there are and what they are used for.
• Talk about what RESTful means to you
• Describe what HATEOAS means to you
• What tools can be used to assure consistent style?
• Why npm shrinkwrap is useful?

Testing

• Describe a test pyramid
• How can you implement it when talking about HTTP APIs?
• Describe mocking, stubbing
• Describe the difference between BDD and TDD
• Why would you use BDD/TDD, are they mutually exclusive?