A small micro-library that shows how libraries like jQuery are made.

MicroLibrary.js

const get = (selector, context) => {
  // Select the items to manipulate
  const GetNodes = function() {
    this.nodes = context ? context.querySelectorAll(selector) : document.querySelectorAll(selector);
  };
  
  // Add new class to nodes
  GetNodes.prototype.addClass = function(className) {
    for (let i = 0, j = this.nodes.length; i < j; i++) {
     this.nodes[i].classList.add(className); 
    }
    return this;
  };
  
  // Remove class from nodes
  GetNodes.prototype.removeClass = function(className) {
    for (let i = 0, j = this.nodes.length; i < j; i++) {
      this.nodes[i].classList.remove(className);
    }
    return this;
  };
  
  return new GetNodes();
};

const headers = get('h1');
const mainHeadings = get('h2', document.querySelector('main'));

headers.addClass('first-class').addClass('second-class').removeClass('removed-class');