The power of C++

Learning C++ as a Javascript developer

Charlie L

Software Engineer @ Google

Twitter: @charliesbot

Podcast: Los Full Stackers

As a javascript developer, I've always heard this...

No one

USES
C++

Then i joined google...

And it was all about C++

if your last attempt to try c++ happened at school...

C++ has changed

C++98

What I learned at School

C++17

What I'm learning at Google

Why, AS JS Developers, we think C++ Sucks

Manual memory allocation: new, delete, etc
Types
Where are my map, filter and reduce?

Memory allocation

void pokeball() {
  Pokemon* bulbasaur = new Pokemon();
  Pokemon* charmander = new Pokemon();
  Pokemon* squirtle = new Pokemon();
  capture(*bulbasaur, *charmander, *squirtle);
  // use bulbasaur
  // use charmander
  // use squirtle
  // ...
  delete bulbasaur;
  delete charmander;
  delete squirtle;
}

void pokeball() {
  Pokemon* bulbasaur = make_unique<Pokemon>();
  Pokemon* charmander = make_unique<Pokemon>();
  Pokemon* squirtle = make_unique<Pokemon>();
  capture(*bulbasaur, *charmander, *squirtle);
  // use bulbasaur
  // use charmander
  // use squirtle
  // ...
}

TYPES

int num = 1;

string text = "hello word";

vector<int> nums = {1, 2, 3, 4};

unordered_map<char, char> dict(
  {
    {'(', ')'}, 
    {'[', ']'}, 
    {'{', '}'}
  }
);

const num: number = 1;

const text: string = "hello word";

const nums: number[] = [1, 2, 3, 4];

const hash: {[key: string]: string} = 
  {
    '(': ')', 
    '[': ']', 
    '{', '}',
  };

auto num = 1;

auto text = "hello word";

vector<auto> nums = {1, 2, 3, 4};

unordered_map<auto, auto> dict(
  {
    {'(', ')'}, 
    {'[', ']'}, 
    {'{', '}'}
  }
);

const num = 1;

const text = "hello word";

const nums = [1, 2, 3, 4];

const hash = {
    '(': ')', 
    '[': ']', 
    '{', '}',
  };

Cool cool... but what about map/filter/reduce?
Loops are for cavemen

the power of modern c++

vector<int> numbers = {1, 2, 3, 4, 5};
vector<int> even_numbers;

copy_if(
  numbers.begin(), 
  numbers.end(), 
  back_inserter(even_numbers), 
  [](int i){ return i % 2 == 0}
);

Filter

vector<int> numbers = {1, 2, 3, 4, 5};
vector<int> doubled_numbers;

transform(
  numbers.begin(), 
  numbers.end(), 
  back_inserter(doubled_numbers), 
  [](int i){ return i * 2 == 0}
);

Map

vector<int> numbers = {1, 2, 3, 4, 5};

int result = accumulate(
  numbers.begin(), 
  numbers.end(), 
  [](int i, int b){ return a + b}
);

Reduce

so, is C++ still a thing?

yes.

It's a solid and mature language
There's tons of libraries
It's efficient and performant!
It has a huge community

Thanks!