Jenny Mok questions

• insertMany Handle Duplicate Errors
• auth component as middleware in react
• Default value of argument in ES6
• webpack 2 expected '!' error using with import
• lodash isEmpty and has method vs simple check
• create-react-app doesn't work with proxy
• multiple condition in ternary operator in jsx
• create-react-app shows an error of "You need to enable JavaScript to run this app."
• init state without constructor in react

Jenny Mok answers