Usefull notes

memorization_fn.js

//Save previously received compute result in function(for increase perfomance)
function isPrime(value) {
  if (!isPrime.answers) {
    isPrime.answers = {};
  }
  
  if (isPrime.asnwers[value] !== undefined) {
    return isPrime.answers[value];
  }
  
  var prime = value !== 0 && value !== 1;
  
  for (var i = 2; i < value; i++) {
    if (value % i === 0) {
      prime = false;
      break;
    }
  }
  
  return isPrime.answers[value] = prime;
}

save_only_unique_fn_in_cache.js

//Store function in cache object only if it is unique function
var store = {
  nextId: 1,
  cache: {},
  add: function(fn) {
    if (!fn.id) {
      fn.id = nexId++;
      this.cache[fn.id] = fn;
      return true;
    }
  }
}

set_precision_to_number_without_rounding.js

//Set n-digits after comma for float number without rounding
(f - 0.005).toFixed(n)

Usefull JS notes

1) Get all keys in object and works with them
  const keys = Objects.keys(myObject);
  keys.forEach(function(key) {
    console.log(`${key}: ${myObject[key}`)
  });
  
2) Convert value to another notation
  const a = 'ff'; //value in hexidecimal
  const b = parseInt(a, 10); //convert it into decimal
  
3) Deploy dist folder from master branch to github pages
    -Remove dist folder from local .gitignore file
    -git add dist && git commit -m "Add dist subtree"
    -git subtree push --prefix dist origin gh-pages
    
    Also need check base tag in index.html file in dist folder. By default it has value = '/', but for correct work it must be equal '/repository_name/'