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    Learn algorithms / prepare for interview daily streams learn programming

    May 06, 2019

    Learn algorithms / prepare for interview daily streams learn programming

    Learn algorithms / prepare for interview daily streams

    Posted: 05 May 2019 10:47 AM PDT

    Hello. I'm software engineer with 15+ years of experience.

    Right now at my free time I work on educational youtube channel about programming, algorithms and so on.

    I pick some problems from hakerrank or similar portals and try to solve and explain same time. Without preparations.

    ​

    I had split content for 3 types:

    1. In pair with junior developer we pick some Easy problem, and focus on explanation related to data structures, algorithms and so on (example: https://www.youtube.com/watch?v=rbn5g_5mc3E)

    2. In pair with experienced developer (but who had not focus on algorithms in past) we pick some medium problem, and try to do everything in way like it happen in big companies (like google) (example: https://www.youtube.com/watch?v=ohs2x5d5Cug)

    3. Alone I pick some Hard problem, and try to solve it in time (example: https://www.youtube.com/watch?v=q5AtgDgMe9I)

    I do not earn anything from this — do it just for fun in my free time (Every day at 8pm PST for 1 hour).

    I'll be glad if some people here will participate in any of stream types.

    ​

    There is million of things that can be improved, but without feedback it is hard to prioritize them.

    ​

    Assumptions:

    - Videos is too slow and not interested to see at all

    - Tasks are boring

    - Bad english

    - I solve problems too slow / looks unexperienced

    - No music on background or other kind of decorations

    - Not enough dedication on every video (read as "I learn nothing after the video")

    - etc

    ​

    One of key points that I want to leave is real-time solving without preparation for exact problem. With that approach viewers can see what is possible to do in case of problems, and what to do if everything goes wrong. This approach closer to real world, where you have second chance.

    submitted by /u/Zav39
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    I built a Final Exam Grade Calculator. It is not much but I am so happy!

    Posted: 05 May 2019 07:54 PM PDT

    I just wanted to share how happy I am! I am not a CS Major, never had experience with coding. I always wanted to pursue CS but was talked out of it for being girl (you know the old song, women not suiting for the job, etc), so I chose another path but with years I realized it is something I am passionate about. So I went ahead and enrolled in a C class. Although people do not recommend C for people who have 0 experience, I took the challenge. My class is so interesting! I love it! I am so motivated that I decided to challenge myself and build something myself, without any instructions.

    I thought of Final Exam Grade calculator. It is something that many students check and I find it really useful. Obviously it already exists so nothing new but I wanted to test myself and see if I am actually capable of building it instead of taking projects with instructions.

    And I did it! I am so happy. Small steps but they means world to me!

    I am sorry, I am just really happy!

    submitted by /u/IBStudent8
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    Beginners Group C++

    Posted: 05 May 2019 03:01 AM PDT

    Hi, is there a c++ group I can join or "we" can start with other beginners where we learn together, help each others anf challenge each other.

    I am thinking of discord but don't mind other ways of communication nor I do mind use a book as starting plan

    Edit:Since the reactivate the post received I am making a discord group, I promise to try making it up to our expectations

    For those who want to join and help here is the link: https://discord.gg/5kcPbp

    submitted by /u/Odai55
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    How many hours a day should I dedicate to learning coding?

    Posted: 05 May 2019 03:06 PM PDT

    I've been trying to spend at least 2 hours a day learning JavaScript. After about 2 hours I tend to get a bit burnt out since all of the concepts are so new to me and I need to take a break for a while. Should I try to spend more time a day learning or should I keep the sessions short? Obviously it's not a science but I figured I'd ask some for some opinions.

    submitted by /u/Frrrosty
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    Jaxi the Robot: A game for kids to learn to program.

    Posted: 05 May 2019 08:10 PM PDT

    After 5 years of pushing through self doubts, I finally have a game ready for alpha! My daughter and her friends just would not let me put this project down, and I'm glad she didn't give up on me.

    This is Jaxi the Robot, a game that teaches kids how to program using javascript. Back in 2014 the concept won grand prize for best game concept in Utah. Please DM me if you want a license key to try it out, I would really love to hear your feedback!

    Mac | PC

    submitted by /u/adunndevster
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    [C++] implementing a const_iterator from a regular iterator without duplicating too much code?

    Posted: 06 May 2019 12:29 AM PDT

    So I have to implement a const_iterator (for a Binary Search Tree), but I already have the logic for a regular iterator. Can I accomplish this without duplicating all the logic of my existing iterator class?

    The instructions are telling me to explore a solution using const_cast, but wouldn't this risk undefined behavior?

    Would I be better off using boolean templates, perhaps?

    submitted by /u/me_not_understand
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    How to find a spot in an 2d array thats so many spots away

    Posted: 05 May 2019 08:41 PM PDT

    Not sure if this belongs here, but I'm trying to, mathematically, find the index of a spot on a 2d array that's x amount of spots away. As in if you have a 6x6 plot and you're at 1,0 and you're trying to find what's 5 spots away how would you calculate that. It would be (0,1)

    I want to do it in away that's not using the two 4 loops method becuse if I have a large array and looking at a spot very far away it'll take a while.

    edit I should clairify i mean like so many spots away. I'm doing horizontally with wrapping. so if you're at 0,0 and want to move 3 spots away you'll be at 0,3.

    submitted by /u/mshcat
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    I need a parser for Google Spreadsheets

    Posted: 06 May 2019 12:22 AM PDT

    I need a parser for Google Spreadsheets that will update the number of subscribers to Youtube for my blogger's database.

    I tried to use IMPORTXML but I'm in the process of downloading and that's it. It doesn't work anymore. If there are any other ways?

    submitted by /u/timofeevvvlad
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    Want to code for ios but I don't have a mac

    Posted: 05 May 2019 08:31 PM PDT

    I was planning on getting an iPhone for my next phone when I upgrade and then code some ios apps but I found out that you need a Mac to do that.

    Is there really no way to legally run a IDE/program on my Windows PC so that I can code for ios apps?

    Thanks

    submitted by /u/Swlonkro
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    Programing for games

    Posted: 06 May 2019 12:14 AM PDT

    Any good references for learning to program specifically for games. My plan is to learn by remaking older games like pokemon or earthbound. Thoughts on my plan? Forgot to mention I need to learn c++

    submitted by /u/Lighght1
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    Can't get jpg to show up on website I'm building

    Posted: 05 May 2019 11:57 PM PDT

    So title says it all. the instagram logo works. What am I missing? https://imgur.com/lAdjbny

    submitted by /u/dude_42
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    What are the benefits of learning markdown?

    Posted: 05 May 2019 08:03 PM PDT

    What are it's applications? I know a little bit of it because of Reddit comments. I remember someone here once said it's a good skill to have. Why?

    submitted by /u/parvinderandroid
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    Stupid question but...

    Posted: 05 May 2019 11:47 PM PDT

    Does anyone know how to create a script to append some text at the end of each of your message in Whatsapp (mobile)? I know that you can use python / JS to create scripts for Whatsapp web but I was wondering if there was anyway to append to do this for the mobile app. If there is a way, how would I go about doing this?

    ​

    Thanks.

    submitted by /u/Rare_Bumblebee
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    [C++] implementing operator++ for custom iterator (for BST) to work with rbegin() and rend()

    Posted: 05 May 2019 03:02 PM PDT

    HI, I'm still working on an iterator for a binary search tree and I was wondering how I should go about implementing the logic for the operator++ when working with rbegin() and rend().

    I understand that rbegin() is basically just begin() except it starts at the "end" and rend() is just like end but it points to before the first element. What I don't understand, however, is how I should go about implementing ++ so that the following code will give me the Node-data in reverse-order:

    for(auto i = root->rbegin(); i != root->rend(); ++i){ //code omitted }

    I was thinking that I could do some ugly solution like setting a boolean in the iterator constructor:

    node_iterator(Node * ptr, bool reversed) : ptr(ptr), reversed(reversed){}

    How is it implemented in STL? Should I perhaps create another class which inherits from the regular iterator but overloads ++?

    I know the logic for ++ so that's not really an issue, but this is mostly how I should approach implementing the logic for ++ so that it decrements when the iterator is reversed.

    Thanks in advance!

    submitted by /u/me_not_understand
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    [ADVISE] Help me to choose React or Angular

    Posted: 05 May 2019 05:29 PM PDT

    Hello,

    ​

    I have already learn nodejs / javascript / ejs via udemy (i took a web development bootcamp course) and now i am in dilemma between Angular 7 and React. I want to learn one of these frameworks and i am really really confused about them. My old teacher had advise me to learn Angular, i read on web good things about this framework and i bought a course in udemy but now i have my doubts.

    ​

    My goal is to create fully multi platform apps with little effort and well optimized. (I don't like to be limited) I like front-end and back-end development. I know Java (JavaFx), android development and C#. I just think that all of these technologies that i know are old.. i want to learn something new and useful so i can have a good job position in the future.

    ​

    I already have pay for Angular 7 lessons in udemy but i read on web that Angular 7 is not fast and responsive in mobile apps as React native.

    ​

    In addition, if i want to use Angular 7 for mobile development i have to learn IONIC framework but does it worth it?

    ​

    Can someone help me to choose?

    submitted by /u/manos2864
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    Cannot Receive String From Entry in TKinter

    Posted: 05 May 2019 11:22 PM PDT

    Hello,
    So I was recently working on a python project where I would create a registration page and a login page for an App that I was writing. To do this, I am able to store information about the user when registered but cannot do so when the user must log in. The variables userLog and passLog have no values even though there is some input that was given. they are called exactly the same way as the registration page so I have no idea why they aren't working. Any help would be greatly appreciated thank you. Here is the code for reference:

    ​

    from tkinter import *

    ​

    root = Tk()

    user1 = StringVar

    root.title("News Feed!")

    root.geometry("700x550+50+20")

    #_________________________________________________________________________

    label = Label(root, text="Create an account", font=("Times New Roman", 50))

    label.pack(pady = 10)

    #___________________________________________________________________________

    userlabel = Label(root, text="Enter a username:", font=("Times New Roman", 20))

    userlabel.pack(pady = 20)

    #___________________________________________________________________________

    username = Entry(root,width=40)

    username.pack(pady = 10)

    #___________________________________________________________________________

    passlabel = Label(root, text="Enter a password:", font=("Times New Roman", 20))

    passlabel.pack(pady = 20)

    #___________________________________________________________________________

    password = Entry(root,width=40)

    password.pack(pady = 10)

    #___________________________________________________________________________

    def clicked():

    global user

    global passwd

    user = username.get()

    passwd = password.get()

    label.destroy()

    userlabel.destroy()

    username.destroy()

    passlabel.destroy()

    password.destroy()

    btn.destroy()

    loading = Label(root, text="Proceed", font=("Times New Roman", 50))

    loading.pack(pady = 80)

    nextBtn = Button(root, text="Proceed to log in", command=logIn)

    nextBtn.pack(pady =30)

    #___________________________________________________________________________

    btn = Button(root, text="Create Account", command=clicked)

    btn.pack(pady = 30)

    ​

    def clear():

    list = root.pack_slaves()

    for l in list:

    l.destroy()

    ​

    def checkInfo():

    usernameMatched = False

    passwordMatched = False

    if (User == user) :

    usernameMatched = True

    ​

    if (Pass == passwd) :

    passwordMatched = True

    ​

    if (User!=user) or (Pass!=passwd):

    usernameMatched = False

    passwordMatched = False

    ​

    if ((usernameMatched == True) and (passwordMatched == True)):

    isLoggedin = True

    ​

    def logIn():

    clear()

    isLoggedin = False

    relogin = Label(root, text="Please log in to see this page", font=("Times New Roman", 30))

    relogin.pack(pady=10)

    ​

    userLab= Label(root, text="Enter your username:", font=("Times New Roman", 20))

    userLab.pack(pady = 20)

    ​

    userLog = Entry(root,width=40)

    userLog.pack(pady = 10)

    passLab = Label(root, text="Enter your password:", font=("Times New Roman", 20))

    passLab.pack(pady = 20)

    print(userLog.get())

    passLog = Entry(root,width=40)

    passLog.pack(pady = 10)

    ​

    global User

    global Pass

    User = userLog.get()

    Pass = passLog.get()

    ​

    login = Button(root, text="Login", command=checkInfo)

    login.pack(pady = 30)

    ​

    ​

    root.mainloop()

    The indentation might be lost so the code can be accessible through this link: https://codeshare.io/aYOl1b

    submitted by /u/aditya_mangalampalli
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    Use of pointers in C++

    Posted: 05 May 2019 11:20 PM PDT

    Hey guys, I just learned about pointers. I know how to use them and what they are. But I still wonder why I should use them. I mean if I create an intager called x and set x = 5; Why should I create a pointer int* ptr = &x; and set *ptr = 10; Instead of just setting x = 10;? And sorry for the poor formating I am writing this on my mobile.

    submitted by /u/GooseHolgerson
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    [C#] Global Overlay Project

    Posted: 05 May 2019 11:10 PM PDT

    I'm currently creating a sort-of "global" overlay in c# wpf, it's designed to overlay the entire screen and not just specific applications, I have a borderless fullscreen (non-exclusive fullscreen) window in wpf which works for anything but an exclusive fullscreen window (such as a game). except I do have some issues with this, it causes other windows to behave very oddly (including the taskbar, sometimes it doesn't hide when it needs to and stays visible even when its not supposed to, such as youtube). In my main and only window xaml file, I have the following arguments:

    ShowInTaskbar="False" Topmost="True" Background="Transparent" AllowsTransparency="True" WindowStyle="None" ResizeMode="NoResize" WindowStartupLocation="Manual" Left="0" Top="0"

    I should probably also mention I have a function that uses extended window styles to make my window act as a tool window, hiding it from things like task switcher (alt + tab) but also has some downsides, it hides the process from the regular task manager list and can only be found by going into the "Details" tab.

    ​

    The way I want this to work is as I said it was designed for above, to overlay the entire screen including the taskbar and not just specific windows, also to not interfere with the normal behavior of windows on the desktop, as is the main problem I'm having. I can provide the code for my "hide from task switcher" method if needed.

    submitted by /u/loneoption
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    Can't view website through github pages?

    Posted: 05 May 2019 07:18 PM PDT

    Hey friends I'm using github pages to host my website but when I click on the URL I get

    ​

    404

    File not found

    The site configured at this address does not contain the requested file.

    If this is your site, make sure that the filename case matches the URL.
    For root URLs (like http://example.com/
    ) you must provide an index.html
    file.

    submitted by /u/spabsa
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    A Compact Guide To Setting Up a BigChainDB Network

    Posted: 05 May 2019 10:58 PM PDT

    How can I reteach myself the basics of java?

    Posted: 05 May 2019 10:53 PM PDT

    I took and passed my community college's programming I class (which teaches java). It covered basic procedural stuff and stayed away from object oriented designed which is what the programming II class is about. Due to personal circumstances I couldn't take the classes back to back and it's been over a year since I've taken the first class. I'm heading into the fall semester which is when I'll take the second class but I don't remember a whole lot of what I learned. Are there any resources I can use to refresh my memory and catch myself back up? Any help is greatly appreciated because at the moment I don't feel like I'm going to be able to keep up come the fall.

    submitted by /u/confusedtylue
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    What helped you become a better programmer?

    Posted: 05 May 2019 10:33 PM PDT

    I'm currently attempting to learn Java using MOOC & a few other recommended resources from this sub and I'm curious to know what are some of the methods and general tips that really helped you become a better programmer when you first started out?

    submitted by /u/lee_c24
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    Netlify isn't showing my deployed website when I click on the url?

    Posted: 05 May 2019 04:13 PM PDT

    Hey guys I'm using netlify to host my website that I just finished and I dragged an dropped my project folder on the page and it says it's deployed. I clicked the link and it just gives me

    Page Not Found

    Looks like you've followed a broken link or entered a URL that doesn't exist on this site.

    submitted by /u/spabsa
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    Git Commit Message best practice question

    Posted: 05 May 2019 03:46 PM PDT

    Hi, I'm just starting down the 'teach-yourself-to-be-a-developer' path and have a question about keeping my GitHub tidy.

    ​

    I work at home and remotely on a PC and Mac laptop respectively. When I come to a stopping point on either I want to commit my changes to GitHub so the next time I have an opportunity to work it doesn't matter which machine I'm on. When I make the commit to my branch for this purpose (as opposed to committing a finished feature) is there a standard/best practice way to write the commit note?

    ​

    I definitely want to be able to easily differentiate between work-in-progress commits and 'real' commits. Also if I'm thinking about this wrong or this is a bad idea let me know the best way to accomplish this. I'd like to avoid an intermediary like Dropbox but I'm not totally opposed to it.

    ​

    Thanks! And just a quick note, I've been mostly lurking here and really appreciate this community, so thanks for helping all of us new folks out.

    submitted by /u/ttreit
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    What should I be doing to maximize my summer learning?

    Posted: 05 May 2019 09:10 PM PDT

    Hi! I just finished my first year of university and I am realizing that I really love CS! I'm really new to the world of CS though, I literally didn't know a thing about it until I realized that I needed to do 2 introductory CS courses during my first year haha. (I'm in a Math program).

    Anyways, my love for programming has made me want to look for a CS job when my co-op term rolls around but because I'm so new at this, I'm not sure where to begin. We used Racket in my first term and then C in my second term and I don't know where to go from here.

    I know I should start a "side project" but I have no idea if that means making a game, a website, some sort of weird calculator, etc. What would employers like the most? What's most useful for me? I've heard people say "just do what you like" but I'm so new I don't really know what I like yet.. I'm a little interested in building a website because it just seems easiest to showcase your skills plus it seems most like a "finished product" that you can admire but would I need to host some sort of server or something? Not sure how all that works...

    I also know I should learn a new language, but what? Python seems to be popular. Or should I learn C++ because it's the language that I'll be using in all my second year CS courses? Or should I not worry about that and just focus on HTML and CSS which is what I would need to build a website? OR should I do both at the same time (or is that not usually done because it's best to focus on one thing at a time??)

    I'd really appreciate some advice on how to kickstart my CS life, I want to make the most of my last summer (Co-op and school terms only after this one).

    Thanks!

    edit: App development is something I was also kind of interested in, but I don't have a mac so I can't code for ios… which apparently is good for people who know c and c++ so that's a bummer..?

    submitted by /u/Swlonkro
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