sematgt

// scrollbar 

// firefox
.textarea {
  scrollbar-color: transparentize($color-titanic, 0.92) transparent;
  scrollbar-width: thin;
}

// the rest, besides IE
.textarea::-webkit-scrollbar-track

sematgt

/*
Differences & Limitations:

Does not have its own bindings to this or super, and should not be used as methods.
Does not have arguments, or new.target keywords.
Not suitable for call, apply and bind methods, which generally rely on establishing a scope.
Can not be used as constructors.
Can not use yield, within its body.
*/

sematgt

// если в колбеке setTimeout используем this, то нужно либо привязка bind, либо стрелочная функция, 
// так как setTimeout вызывает колбек в другом контексте и this внутри функции будет глобальным объектом

// wrong

var obj = {
    count : 10,
    doSomethingLater : function (){
        setTimeout(function(){ // the function executes on the window scope
            this.count++;

sematgt

function sum(a, b, c) {
    return a + b + c;
}


function curry(func) {
    return function curried(...args) {
        if (args.length >= func.length) {
            return func.apply(this, args);

sematgt

const obj = {
    length: 4,
    0: 'one',
    1: 'two',
    2: 'three',
};

console.log(Array.from(obj, (v, i) => {
    if (v === undefined) {
        return 'no element';

sematgt

class Clock {
  
  constructor({ template }) {
    this.template = template;
  }

  stop() {
    clearInterval(this.timer);
  };

sematgt

function throttle(f, ms) {

  return function updater() {
    
    if (updater.ready === false) {
      updater.args = arguments;
      return;
    }
    updater.ready = false;
    f.apply(this, arguments);

sematgt

function spy(func) {
  wrapper.calls = [];

  function wrapper() {
    wrapper.calls.push([...arguments]);
    func(...arguments);
  }

  return wrapper;
}

sematgt

function loopSumTo(n) {
    let sum = 0;
    
    for (let i = n; i >= 1; i--) {
        sum += i;
    }

    return sum;
}

sematgt

function Calculator() {
  this.operations = {
    '+': (a, b) => +a + +b,
    '-': (a, b) => a - b,
  };
  
  this.validateInputNumbers = function(arr) {
    return !(isNaN(arr[0]) || isNaN(arr[2]))
  };