Buggytheclown

https://stackblitz.com/edit/rs-react-interview-vector-cp-mj19y8

import React, { useState, useEffect, useRef, useContext } from "react"; import "./style.css";

function range(x) { return Array.from({ length: x }, (_, ind) => ind); }

// 1) Is it possible to use React without JSX?

Buggytheclown

// *** Variables, Hoisting, Closures ***

// *Understanding of scope*
(function () {})();

(function () {
  for (var vari = 5; vari > 0; vari--) {}

  for (let leti = 5; leti > 0; --leti) {}

Buggytheclown

class A extends Component<Props> {
    sumMemoized = memoizeLast((a, b) => a + b);
    computedAliasForOtherProp = memoizeLast(props => props.field.deep.nested);

    get aliasForOtherProp() {
        return this.computedAliasForOtherProp(props);
    }

    get result() {
        return this.sumMemoized(this.props.a, this.aliasForOtherProp);

Buggytheclown

const q3 = () => q2;
const q2 = command => (command === '0' ? q3 : q2);
const q1 = command => (command === '1' ? q2 : q1);

function Automaton1() {
    return {
        readCommands(commands) {
            const lastState = commands.reduce(
                (state, command) => state(command),
                q1

Buggytheclown

function lookLike(prop1, asProp2) {
  if (prop1 === asProp2) {
    return true;
  }
  if (typeof prop1 !== "object" || typeof asProp2 !== "object") {
    return false;
  }
  return Object.entries(asProp2).every(([k, v]) => lookLike(prop1[k], v));
}

Buggytheclown

# Find top 30 the most wanted files sorted by commit count
git log --name-only --pretty=format: src | sort | uniq -c | sort -nr | head -n 30

# Find top 10 the largest '*.js' files sorted by size
find . -name '*.js' -type f -ls | sort -k7 -r | head -n 20

# count lines of code, without directory 'migrations'
find . -name migrations -prune -o -name '*.ts' | xargs wc -l

Buggytheclown

const MAX_DIVISOR = 99999;
const MIN_DIVISOR = 10000;

function isPalindrome(number) {
    let rebmun = 0;
    let remainder = number;
    while (remainder !== 0) {
        let lastDigit = remainder % 10;
        rebmun = rebmun * 10 + lastDigit;
        remainder = (remainder - lastDigit) / 10;

Buggytheclown

class CA {
  static staticMethodA() {
    return 42;
  }

  constructor(name = 'default name') {
    this.name = name;
  }

  methodA() {

Buggytheclown

/* 
* Descriptions:
* Implement curry function.
*/

// Outputs:
function sum3(a, b, c){
  return a + b + c;
}
var sum3_curryed = curry(sum3);

Buggytheclown

/*
 * IIFE
 * https://en.wikipedia.org/wiki/Immediately-invoked_function_expression
 */
(function() {
})();

/*
 * Comparison operators
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comparison_Operators