Software Development and Programming Careers (Official Discussion Thread)

Secure Da Bag · Jan 22, 2020

Has anyone taken any of the LinkedIn programming tests? If so, how was it?

Obreh Winfrey · Jan 22, 2020

For Da Bag said:
Has anyone taken any of the LinkedIn programming tests? If so, how was it?

For the little badge or whatever? I did the java one a couple weeks ago. It wasn't anything difficult, maybe a few questions that might make you think for a few.

kevm3 · Jan 23, 2020

front end development can be so nasty these days

Ace2306 · Jan 23, 2020

kevm3 said:
front end development can be so nasty these days

How so?

You ever finished PerScholas?

Secure Da Bag · Jan 23, 2020

Obreh Winfrey said:
For the little badge or whatever? I did the java one a couple weeks ago. It wasn't anything difficult, maybe a few questions that might make you think for a few.

Figured it might help with job finding.

Obreh Winfrey · Jan 23, 2020

For Da Bag said:
Figured it might help with job finding.

Certainly won't hurt. It'll separate the people who know of Java from the people who actually know it. I also took a JSON and Maven one as well. If that had Docker and Kubernetes I would have taken them as well.

kevm3 · Jan 25, 2020

Ace2306 said:
How so?

You ever finished PerScholas?

IE 10 if you have to support it... Companies that decide to make everything ngrx/rxjs... or try to do crazy things with webpack

FluffyCorleone · Jan 27, 2020

I'm probably shooting myself in the foot by avoiding redux (seems just as important as react) but I wrote my own state manager using a singleton class. I feel that the whole redux/flux architecture is convoluted bullshyt.

Repository.jsx

Code:

export default class Repository {

    constructor() {

        if( Repository.instance instanceof Repository ) {
            return Repository.instance ;
        }

        this.state = {
            counter: 0
        } ;
       
        this.subscribers = [] ;

        Object.freeze( this.counter ) ;
        Object.freeze( this ) ;
        Repository.instance = this ;
    }

    addSubscriber( component ) {
        this.subscribers.push( component ) ;
    }

    notifySubscribers() {
        this.subscribers.forEach( (value) => {
            value.forceUpdate() ;
        })
    }

    get(key) {
        return this.state[key] ;
    }   

    incrementCounter( n = 1 ) {
        this.notifySubscribers() ;

        this.state.counter += n ;
        return this.state.counter ;
    }
}

CounterDisplay.jsx

Code:

import React, { Component } from 'react'
import Repository from '../Repository'

export default class CounterDisplay extends Component {

    constructor(props) {
        super(props) ;       

        this.s = new Repository() ;
        this.s.addSubscriber( this ) ;

        console.log( this.s.get( 'counter') ) ;       
    }

    render() {
        return (
            <div>
                <h1>
                    Current Counter: {this.s.get( 'counter')}
                </h1>
            </div>
        )
    }
}

CounterButton.jsx

Code:

import React, { Component } from 'react'
import Repository from '../Repository'

export default class CounterButton extends Component {

    constructor(props) {
        super(props) ;

        this.onSubmit = this.onSubmit.bind(this) ;

        this.s = new Repository() ;       
    }

    onSubmit(e) {

        this.s.incrementCounter() ;
        console.log( this.s ) ;
    }

    render() {
        return (
            <div>
                <button onClick={this.onSubmit}>Press Me!</button>               
            </div>
        )
    }
}

Motherfukk this shyt

My shyt is easier imo.

Even this well known youtuber has trouble explaining this overcomplicated shyt. No human can understand the first 5 minutes of this

Secure Da Bag · Jan 27, 2020

FluffyCorleone said:
My shyt is easier imo.

Even this well known youtuber has trouble explaining this overcomplicated shyt. No human can understand the first 5 minutes of this

Try your hand at Elm. It might be... saner for you.

Ace2306 · Jan 27, 2020

This has been a great resource.

Koli_Kat · Jan 27, 2020

FluffyCorleone said:

I'm probably shooting myself in the foot by avoiding redux (seems just as important as react) but I wrote my own state manager using a singleton class. I feel that the whole redux/flux architecture is convoluted bullshyt.

Repository.jsx

Code:

export default class Repository {

    constructor() {

        if( Repository.instance instanceof Repository ) {
            return Repository.instance ;
        }

        this.state = {
            counter: 0
        } ;
      
        this.subscribers = [] ;

        Object.freeze( this.counter ) ;
        Object.freeze( this ) ;
        Repository.instance = this ;
    }

    addSubscriber( component ) {
        this.subscribers.push( component ) ;
    }

    notifySubscribers() {
        this.subscribers.forEach( (value) => {
            value.forceUpdate() ;
        })
    }

    get(key) {
        return this.state[key] ;
    }  

    incrementCounter( n = 1 ) {
        this.notifySubscribers() ;

        this.state.counter += n ;
        return this.state.counter ;
    }
}

CounterDisplay.jsx

Code:

import React, { Component } from 'react'
import Repository from '../Repository'

export default class CounterDisplay extends Component {

    constructor(props) {
        super(props) ;      

        this.s = new Repository() ;
        this.s.addSubscriber( this ) ;

        console.log( this.s.get( 'counter') ) ;      
    }

    render() {
        return (
            <div>
                <h1>
                    Current Counter: {this.s.get( 'counter')}
                </h1>
            </div>
        )
    }
}

CounterButton.jsx

Code:

import React, { Component } from 'react'
import Repository from '../Repository'

export default class CounterButton extends Component {

    constructor(props) {
        super(props) ;

        this.onSubmit = this.onSubmit.bind(this) ;

        this.s = new Repository() ;      
    }

    onSubmit(e) {

        this.s.incrementCounter() ;
        console.log( this.s ) ;
    }

    render() {
        return (
            <div>
                <button onClick={this.onSubmit}>Press Me!</button>              
            </div>
        )
    }
}

Motherfukk this shyt

My shyt is easier imo.

Even this well known youtuber has trouble explaining this overcomplicated shyt. No human can understand the first 5 minutes of this

Redux is hot garbage- too much boilerplate, over-engineered. Try using the context API.

FluffyCorleone · Jan 28, 2020

I'm coding a simple genetic algorithm program in javascript and some times the browser crashes lmao

Koli_Kat said:
Redux is hot garbage- too much boilerplate, over-engineered. Try using the context API.

It seems that alot of stuff facebook makes is overengineered: React, redux, graphql, etc. VueJs is way more pleasant to work with. And it's accompanying state manager (vuex) is so easy a 5 year old could understand. I've watched several videos on graphql and don't quite 'get it'.

Secure Da Bag · Jan 30, 2020

Ever had that knot in your stomach. That nagging feeling. That though pervasive thought of "how the hell do I make the fibonacci sequence tail-recursive?"

Well. Here's the answer to make all your worries go away.

Macallik86 · Feb 3, 2020

BiggWebb79 said:
Yeah I like Traversy Media, i also follow CodingPhase,TheRealCasadaro,RealToughCandy,JulioCodes,BlackNightCoding,and a few others.

Randomly came across this suggestion and I've been binging his videos at work. I'm halfway through his journey but breh decided to get a second job so that he could double his salary from $100k to $200K and flip the excess in real estate :ohlawd:

FluffyCorleone · Feb 3, 2020

200 line genetic algorithm in c++. Type in a single phrase in all lower case and it tries to guess the target phrase in multiple generations. In each generation it gets better and better:

Code:

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <tuple>

#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif

namespace intelligence {

    const unsigned CHARCODE_BEGIN = 97 ;
    const unsigned CHARCODE_END = 122 ;

    class Chromosome {

        std::vector<char> _genes ;

      public :

        Chromosome(): _genes{} {}

        Chromosome( unsigned short geneSize ) {

            for( int i = 0 ; i < geneSize ; i++ )     
                _genes.push_back( CHARCODE_BEGIN + rand() % (CHARCODE_END-CHARCODE_BEGIN+1) ) ;
        }

        float calculateFitness( const std::string& target ) {

            float fitnessScore = 0.0f ;         

            for( int i = 0 ; i < _genes.size() ; i++ ) {

                if( _genes[i] == target[i] )
                    fitnessScore++ ;                 
            }

            return pow( fitnessScore / target.length(), 2 ) ;
            //return fitnessScore / target.length() ;
        }

        Chromosome crossover( const Chromosome& other ) {

            Chromosome child ;
            std::vector<char> newGenes ;         
            int midPoint = rand() % other.size() ;

            for( int i = 0 ; i < this->size() ; i++ ) {
             
                if( i > midPoint )
                    newGenes.push_back( other.getGene( i ) ) ;

                else
                    newGenes.push_back( this->_genes[i] ) ;
            }

            child.setGenes( newGenes ) ;

            return child ;
        }

        void mutate( float mutationRate ) {

            std::replace_if( _genes.begin(), _genes.end(), [mutationRate]( char unused ) {
                return ( ((rand() % 100) * 0.01f) < mutationRate ) ;
            }, CHARCODE_BEGIN + rand() % (CHARCODE_END-CHARCODE_BEGIN+1) ) ;         
        }

        void setGenes( const std::vector<char> genes ) {
            _genes = genes ;
        }

        std::vector<char> getGenes() const{ return _genes ; }
        char getGene( int idx ) const{ return _genes[idx] ; }

        unsigned int size() const{ return _genes.size() ; }
    } ;

    class Population {

        std::vector<Chromosome> _population ;
        unsigned short _generation ;
        unsigned short _mutationRate ;
        std::string _target ;

      public :

        Population( unsigned short popSize, const std::string target, unsigned short mutationRate ): _target(target),
            _mutationRate(mutationRate), _generation(0) {

            for( int i = 0 ; i < popSize ; i++ )
                _population.push_back( Chromosome( target.length() ) ) ;         
        }

        void acceptReject() {

            std::vector<Chromosome> newPopulation ;
            unsigned short maxFitness = getHighestFitnessScore() ;

            for( unsigned int i = 0 ; newPopulation.size() < _population.size() ; i++ ) {         
             
                Chromosome parentA = _population[ rand() % _population.size() ] ;
                Chromosome parentB = _population[ rand() % _population.size() ] ;             
                float randomScore = 0.01f + (rand() % maxFitness) * 0.01f ;

                float parentAScore = parentA.calculateFitness( _target ) ;
                float parentBScore = parentB.calculateFitness( _target ) ;

                if( (parentAScore > randomScore) && (parentBScore > randomScore) ) {
                 
                    Chromosome child = parentA.crossover( parentB ) ;
                    child.mutate( _mutationRate ) ;
                 
                    newPopulation.push_back( child ) ;
                }
            }

            _population = newPopulation ;
            _generation++ ;
        }

        void run() {

            float bestScore = 0.0f ;

            std::cout << "Target: " << _target << '\n' ;

            while( bestScore < 1.0f ) {

                std::tuple<std::string, float> info ;

                info = getHighestFitness() ;
                bestScore = std::get<1>(info) ;
             
                std::cout << "Generation: " << _generation << "; Best Guess: " << std::get<0>(info) << "; Best Score: " << bestScore*100 << "%\n" ;

                acceptReject() ;
            }
        }

        unsigned getHighestFitnessScore() {

            float highest = 0.0f ;

            for( auto itr : _population ) {

                float fitnessScore = itr.calculateFitness( _target ) ;

                if( fitnessScore > highest )
                    highest = fitnessScore ;
            }

            return unsigned(highest * 100) ;
        }

        std::tuple<std::string, float> getHighestFitness() {         
         
            std::vector<char> highestString ;
            float highestScore = 0.0f ;         

            for( auto itr : _population ) {

                float fitnessScore = itr.calculateFitness( _target ) ;

                if( fitnessScore > highestScore ) {
             
                    highestScore = fitnessScore ;
                    highestString = itr.getGenes() ;
                }
            }

            std::string s( highestString.begin(), highestString.end() ) ;

            return std::make_tuple( s, highestScore ) ;
        }     

    } ;
}

void printGenes( const std::vector<char>& genes ) {
    for( auto itr: genes )
        std::cout << itr ;

    std::cout << '\n' ;
}

int main() {

    srand( time(NULL) ) ; 

    std::string target ;
    std::cout << "Enter Target Phrase: " ;
    std::getline( std::cin, target ) ;

    intelligence::Population p( 1500, target, 0.05f ) ;
    p.run() ;

    return EXIT_SUCCESS ;
}

Software Development and Programming Careers (Official Discussion Thread)

More options

Secure Da Bag

Veteran

Obreh Winfrey

Truly Brehthtaking

kevm3

follower of Jesus

Ace2306

All Star

Secure Da Bag

Veteran

Obreh Winfrey

Truly Brehthtaking

kevm3

follower of Jesus

FluffyCorleone

Banned

Secure Da Bag

Veteran

Ace2306

All Star

Koli_Kat

Superstar

FluffyCorleone

Banned

Secure Da Bag

Veteran

Macallik86

Superstar

FluffyCorleone

Banned