Why React? A framework/ library that can break down complex components and allow us to reuse code Virtual DOM is faster than real DOM. Allows ReactJS to know when exactly to re-render or ignore certain specific pieces of DOM, reducing the performance cost of updating the real DOM. Who uses React? Facebook…

Comments: /*Multiline *. //One Line Functions: function sum(a,b){ return a+b; } Edit DOM: document.getElementID("elementID").innerHTML = "HELLO HELLO " ; For Loop: for(let i=0; i< thing.length; i++){} While Loop: while (i< thing.length){} Do-While Loop: do{ } while(condition) * performs action then checkes conditional * Switch Statements: switch(condition) {…

Sample Website used in this example: https://webscraper.io/test-sites/e-commerce/allinone HTTParty: Gem our scraper uses to send an HTTP request to the page(s) we’re scraping. Nokogiri: (鋸) is an HTML, XML, SAX, and Reader parser. Side Note: Scraping = Accessing the data, Parsing = Making sense of the data. Nokogiri uses CSS selectors to parse.