findIndex 3 mdn 2 Node.prototype.remove 2 Node.prototype.after 2 Node.prototype.before 2 Node.prototype.prepend 2 Node.prototype.append 2 Node.prototype.addEventListener 2 String.prototype.trim 2 String.prototype.padEnd 2 String.prototype.padStart 2 String.prototype.endsWith 2 String.prototype.startsWith 2 String.prototype.repeat 2 String.prototype.includes 2 Array.prototype.reduce 2 Array.prototype.some 2 Array.prototype.includes 2 polyfill 2 polyfills 2 Number.isNaN 2 Number.isInteger 2 CustomEvent 2 MouseEvent 2 HTMLCanvasElement.prototype.toBlob 2 Element.prototype.classList 2 Element.prototype.matches 2 Element.prototype.toggleAttribute 2 Element.prototype.closest 2 Function.prototype.bind 2 NodeList.prototype.forEach 2 Node.prototype.firstElementChild 2 Node.prototype.children 2 Node.prototype.replaceWith 2 Array.prototype.filter 2 bind 2 endsWith 2 startsWith 2 repeat 2 reduce 2 some 2 includes 2 firstElementChild 2 filter 2 fill 2 forEach 2 find 2 from 2 of 2 create 2 assign 2 Array.prototype.forEach 2 Array.prototype.find 2 Array.prototype.fill 2 Array.from 2 Array.of 2 Object.values 2 Object.keys 2 Object.entries 2 Object.create 2 Object.assign 2 toBlob 2 isNaN 2 isInteger 2 matches 2 toggleAttribute 2 closest 2 es2015 1 es6 1 nodejs 1 js 1 javascript 1 array-methods 1 findindex 1 native 1 performance 1 Array.findIndex 1 array 1 arr 1 Element.prototype.getAttributeNames 1