The article Formik —Handling files and reCaptcha by João Miguel Cunha - Dec 18, 2017 has most of the code as embedded CodeSandbox, but hackernoon doesn't support CodeSandbox embeds and the fallback image doesn't link to the sandbox. I had to go hunt for this same article on other platforms to get the code, found that it's on Medium too and shows the sandbox properly.
The article Formik —Handling files and reCaptcha by João Miguel Cunha - Dec 18, 2017 has most of the code as embedded CodeSandbox, but hackernoon doesn't support CodeSandbox embeds and the fallback image doesn't link to the sandbox. I had to go hunt for this same article on other platforms to get the code, found that it's on Medium too and shows the sandbox properly.
Hackernoon article link - CodeSandbox not accessible Medium article link - CodeSandbox embeds are loaded