Congrats, Wasif! Tell more about it, if you have time! I love hearing from students who have benefited from the courses. You getting a job is 99% your own hard work, and maybe 1% my courses, so congrats on putting in all that work and time to make it happen!

@@ColtSteeleCode you are being modest, this was the second interview I attended and got placed in a product based company...never knew I had it in me....WDB paved my way into web development and from then on I kept on going and learning more and more.. currently I will be working on Vue js to create a UI... P.S - I left you an inmail on LinkedIn last month thanking for your awesome course which helped me to get an awesome job...maybe it did not reach you...I really hope all the students make it to their web development dreams

@@ColtSteeleCode if sets use hash how the items be ordered I mean if the search for item is big o of one then that's mean we use array not binary tree to implement it seems how items are ordered

This is me too

I was en mail email then i saw there a new video and i stop everything and start watching it

Gahhh thanks for pointing that out. In my original solution I used a map along with a set to calculate the frequency of values. I have no idea why I thought this would work without the map! If only I could edit youtube videos after publishing them!

Hi Randy, thanks for the suggestions! I actually have a video on recursion out already, but I've added closures to the list *shudders at the mention of teaching closures*

Hi Rahul, I've added it to the list! It'll probably be out next week or the following week depending on my schedule. Thanks for the suggestion!

Do you understand it now? Took me a while to get but it clicks eventually

`~` is the symbol for "bitwise NOT". To understand what it does, and why it helps here, we have to look at how numbers work on computers. I'm sure you've heard about numbers being stored as binary 0011 0101, etc. Each of the digits are called a bit, and they're all added up as 2^n if 1 from the right side, so 0011 0101 would be 1+0+4+0+16+32+0+0 = 55. This is not entirely true, because with "signed" numbers (numbers than can be positive or negative, rather than just positive) The "most significant bit" (the bit furthest to the left) is reserved to denote the "sign" of a number (positive/negative). Now back to bitwise NOT, the operator simply flips all the bits from 1 to 0 and 0 to 1. So with my example above, ~0011 0101 becomes 1100 1010 = 2+8+64+128 = 202. This is only true if the number is an "8-bit unsigned integer", i.e. it is only made of 8 bits, it can't be negative, and it can't have a fraction (numbers after decimal point). However, if we took this same number and reserved the most significant bit for a sign, the NOT operator would give us a different results. ~0011 0101 = 1100 1010 = -1 * (2+8+64) = -70, The most significant bit, which previously became 128, now becomes "-", and just makes the whole number negative. We could do bitwise NOT on the negative number, and get a positive number too: ~(-70) = 55. Now, this isn't entirely true, because JavaScript and most other languages don't store negative numbers like that. Instead, they use something called two's compliment, which means it also adds 1 to the final result (though it doesn't affect the sign). Because of this, the number "-1" would be 1000 0000. The most significant bit (1) tells us it's negative, and adding all the numbers together, it just becomes 0. Then add 1, and you get -1 (because of the sign). This only happens for negative values, though, so 0000 0000 is still 0, and 0000 0001 is just 1. Funnily enough, this means we can always represent one more negative value than we can of positive values, regardless of how many bits we have. In this signed 8-bit example, we can store anything from -128 to 127. Now back to JS, the method `.indexOf()` will return the index of an element (a positive number or 0), or it will return -1 if it doesn't find any element. Since 0 is a reasonable answer if it finds something, that means you can't just do the normal `!value` to check if a something is exists or not. Instead, you have to either explicitly check if the index is -1, or if it is less than 0. BUT, knowing the bitwise NOT operator, you can be cheeky. Any NON-ZERO value in JS is treated as truthy, which means negative numbers are also truthy. So... if we NOT the index, "0" becomes -1, "1" becomes -2, "2" becomes -3, and "-1" becomes 0. The only value that becomes 0 after a bitwise NOT is -1, and it's -1 we want to check for, so we can just check if a value is not -1 by doing `!~value` !~(-2) => false !~(-1) => true !~(0) => false !~(1) => false !~(2) => false I know your message is relatively old, but hopefully this answered the question if someone else were wondering, or if you forgot about this and didn't look back. TL;DR: !~value is a dirty hack to check if a value is -1

Hi Nicholas, I really appreciate the sentiment but I don't feel super comfortable setting a Patreon when I also create paid courses on Udemy. I know others do it, but it feels kind of slimy to me. Maybe I'm crazy. With that said, I've been working on a new project I'm very excited about. For anyone else reading this...don't worry I'm not leaving Udemy! Later this year I'll be launching a subscription website with tons of new shorter courses on topics like React Native, TypeScript, Vue, GraphQL, Advanced Data Structures/Algorithms, Testing, Angular, Observables, MongoDB, Node, Project Codealongs, and a bunch more. This will not replace my Udemy courses, but rather supplement the longer courses on Udemy with more modular, specific courses on important topics. To be successful on Udemy, most courses need to be 30-40 hour behemoths, but there are tons of topics that don't work well in that format. This new website will feature tons of courses and each month I'll add a new course. Students will get to suggest and vote on new course topics, and I'll be able to make them in a couple weeks rather than a couple months. I haven't decided on exact pricing yet, but it'll be somewhere around the price of a single udemy course on sale ($10-20). I'll also have "scholarships" available for students who can't afford to subscribe. All along the way, I'm going to continue posting new content to KZfaq too. Sorry for the long answer! This is something I'm really excited about.

@@ColtSteeleCode Awesome, really excited .

YOU GOT ME AGAIN. Once again, I was braced for something horrible! Thanks for the nice note instead. I'm actually working on my own website which will offer a bunch of small courses. It'll be out sometime later this year! I'm very excited about it. Let me know if you have any topic requests for youtube videos!

Colt Steele If you need help to build your website there is an amazing bootcamp on UDEMY that will make you all set up for success it’s an advanced web developer the part that you will love the most would probably be the advanced CSS since it’s something that would easily benefit your react tutorials ... anyway if you can find ideas from that CSS teacher (but it’s also important to stay your self and not copy the style of that young talent) haha 🤣 I feel like I will watch again I still need to improve my front end skills LoL 😂 Keep up your amazing work and make sure you enroll as many people as you can (trough subscriptions and more) because it’s sure you will be able to get to the level where it’s getting you interesting income from KZfaq I which you that because it’s surely more work than we can imagine to be able to do new videos on such a schedule 😄

Colt Steele you MUST mention my name if every you say you are doing TypeScript because of the request of someone in the comments or something and why not including a review of my VSCODE colour theme if you do a video on that great IDE (It’s called Pop N' Lock Theme by Luxcium ✨) it’s on the market place it has been trending in the top FIRST extension for one week a month ago it’s designed with TypeScript in mind and JavaScript also 😄

That one will be the next JS video I do, probably next week or the following week! Thanks for the suggestion!

@@ColtSteeleCode you haven't done maps yet :(((

Those noises are very adorable! It's not so adorable when they get too hot and start their distress chirps :( We've had a heatwave here, and I don't have air conditioning which made things difficult! I had to move my one tiny portable AC unit into the room with the chickens, which means my office and bedroom at impossibly hot! The things I do for those baby chicks...