javascript - How can i create nested functions -

i'm trying create "nested functions". can't seem find solution!

const func1 = (value1) => {   const func2 = (value2) => {     console.log(value1 + value2)   } }  func1(2).func2(3) 

what want accomplish create own little "jquery function"

const $ = (element) => {   const addclass = (name) => {       const x = document.queryselectorall(element);     (i = 0; < x.length; i++) {       x[i].classname = name     }   } }  $('#circle').addclass('nice') 

i think topic broad single question, here simple example of how this, started:

const $ = (selector) => {    const items = document.queryselectorall(selector);      const self = {      addclass: (name) => {        (let = 0; < items.length; i++) {          items[i].classlist.add(name);        }          return self;      },      removeclass: (name) => {        (let = 0; < items.length; i++) {          items[i].classlist.remove(name);        }          return self;      }    };      return self;  }    $('#circle').addclass('nice').removeclass('bad');

.nice {    color: green;  }  .bad {    color: red;  }  .fancy {    text-decoration: underline;  }

<div id='circle' class='bad fancy'>    hello  </div>