Script.js

/*==================== SHOW MENU With Toggle====================*/
const showMenu = (toggleId, navId) =>{
    const toggle = document.getElementById(toggleId),
    nav = document.getElementById(navId)
    
    // Validate that variables exist
    if(toggle && nav){
        toggle.addEventListener('click', ()=>{
            // We add the show-menu class to the div tag with the nav__menu class
            nav.classList.toggle('show-menu')
        })
    }
}
showMenu('nav-toggle','nav-menu')

/*==================== DARK LIGHT THEME ====================*/ 
const themeButton = document.getElementById('theme-button')
const darkTheme = 'dark-theme'
const iconTheme = 'bx-sun'

// Previously selected topic (if user selected)
const selectedTheme = localStorage.getItem('selected-theme')
const selectedIcon = localStorage.getItem('selected-icon')

// We obtain the current theme that the interface has by validating the dark-theme class
const getCurrentTheme = () => document.body.classList.contains(darkTheme) ? 'dark' : 'light'
const getCurrentIcon = () => themeButton.classList.contains(iconTheme) ? 'bx-moon' : 'bx-sun'

// We validate if the user previously chose a topic
if (selectedTheme) {
  // If the validation is fulfilled, we ask what the issue was to know if we activated or deactivated the dark
  document.body.classList[selectedTheme === 'dark' ? 'add' : 'remove'](darkTheme)
  themeButton.classList[selectedIcon === 'bx-moon' ? 'add' : 'remove'](iconTheme)
}

// Activate / deactivate the theme manually with the button
themeButton.addEventListener('click', () => {
    // Add or remove the dark / icon theme
    document.body.classList.toggle(darkTheme)
    themeButton.classList.toggle(iconTheme)
    // We save the theme and the current icon that the user chose
    localStorage.setItem('selected-theme', getCurrentTheme())
    localStorage.setItem('selected-icon', getCurrentIcon())
})