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Oliver Jumpertz Profile picture
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17 Jul, 4 tweets, 1 min read
Debugging 101

1. Start your debugger
2. Trigger an action
3. Skip the first 10 breakpoints you forgot to remove last time
4. Realize you forgot to set a new breakpoint
5. Abort
6. Set a new breakpoint
7. Retrigger the action

👇🏻
8. Sigh because you need to skip the 10 first breakpoints again
9. Realize you accidentally also skipped your new breakpoint
10. Retrigger the action
11. Skip and remove each of the first 10 breakpoints you forgot to remove once again
12. Stop at the right breakpoint

👇🏻
13. Stare at your screen and think
14. Realize you should have set the breakpoint earlier
15. Abort
16. Set a new breakpoint
17. Retrigger the action
18. Stare at your screen again
19. Think and cry a little
20. Take a break

👇🏻
21. Gome back and stare at your screen again
22. Decide to add log statements
23. Lose hope again
24. Take a closer look
25. Line 162 should be a + b * z and not a - b * z
26. Close the debugger and forget to remove your breakpoints
27. Fix the bug

• • •

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More from @oliverjumpertz

Oliver Jumpertz Profile picture
17 Jul
"Where do you see yourself in five years?"

This is still a common job interview question.

But do you hate it as much as I do and would love to stand up and simply leave immediately?

Don't.

Here is how you can turn this question into a huge win.

A thread. ↓
0. Foreword

I've interviewed countless times in the last years and had the honor to interview some amazing engineers myself.

I never used this question myself but had to witness HR ask exactly this one.

1/40
It took me a good amount of time to understand that, while being a question most interviewees hate, it's an HR trick to gather valuable information.

2/40
Read 41 tweets
Oliver Jumpertz Profile picture
16 Jul
💛 HTML tip 💛

You can force a user's browser to open a new tab when clicking on a link by adding target="_blank" to it.

But you should always add rel="noreferrer" to it!

The reason and an explanation in a short thread. ↓ <a href="https://anydomain.com" target="_blan
When a new tab opens, the page loaded gets access to the window.opener attribute. If the site has malicious code in it, it can use the opener property to redirect your page to another malicious site that might harm the user.

1/7
Adding rel="noreferrer" prevents that the window.opener property is accessible for the site linked to and additionally skips sending a Referer HTTP header to that page with your website's URL.

2/7
Read 8 tweets
Oliver Jumpertz Profile picture
15 Jul
"Are there any questions left we can answer?"

"No, not right now, thank you."

Have you ever encountered this situation in an interview and responded like above?

I'm sorry, but you've given away an awesome opportunity to make a lasting impression.

A thread.
0. Foreword

I've been on both sides of the interview table for a few years now.

I've interviewed for positions, and I've interviewed quite a few awesome engineers.

I can only give you my perspective and opinion. It does not necessarily need to be fitting each situation.

1/32
1. Why this question is an opportunity

Although there is a shortage of software developers right and left, many companies still want to make sure they hire the right people.

Even the best engineers may not be the best fit for a company and its culture.

2/32
Read 34 tweets
Oliver Jumpertz Profile picture
15 Jul
Did you know that a unit test should have three basic blocks?

1. Arrange / Given
2. Act / When
3. Assert / Then

Let's quickly go over them so you get a better idea.

A thread.
1. Arrange / Given

This is where you set up everything you need to trigger the logic you want to test.

No matter whether you initialize input variables or specify the result you later expect. This is where this logic belongs.

1/10
'Given' is a term coming from behavior-driven design where human-readable "user stories" are used to describe your expectations.

You can read it as: "Given this input or setup...".

2/10
Read 11 tweets
Oliver Jumpertz Profile picture
14 Jul
Testing JavaScript can be difficult.

It sometimes can be hard to write excellent tests that assert that what you developed really works.

To support you, I compiled some beginner-friendly JavaScript testing resources for you.

A thread.
1. JavaScript testing for beginners

This is a course that delivers one lesson each day to your inbox.

You can do it at your own pace.

Perfect for beginners, with some great advice.

marclittlemore.com/javascript-tes…

1/9
2. Introduction To JavaScript Unit Testing

This article is a great guide for beginners.

It walks you from your code as it might be, over making it actually testable, to finally covering it with tests.

smashingmagazine.com/2012/06/introd…

2/9
Read 10 tweets
Oliver Jumpertz Profile picture
13 Jul
Let's be honest, CSS can be pretty difficult.

I had a hard time learning it, but there are a few resources that can definitely help you to understand the style language of the web.

Here is a collection of my favorite ones.

A thread.
1. codrops

An extensive CSS reference that will serve you even better than MDN.

Definitely, my go-to resource when I want to look something up.

tympanus.net/codrops/css_re…

1/11
2. The box model

Everything in HTML and CSS has something to do with a box. Some elements are block elements, others are inline elements.

This concept can actually be pretty difficult to understand.

This article on MDN makes it clear for you.

developer.mozilla.org/en-US/docs/Lea…

2/11
Read 15 tweets

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