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Author: admin@master

Combine object key values into single string with separator

I want to achieve this: Result: Test – Lorem ipsum dolores I have some solution with for loop, and some stirring operations and so on but I am sure there’s a better way.. Answer You can use Array#map method along with Array#join method. Where Array#filter method can be used for filtering non-empty…

Preview images before upload

I have a page with four images for the user to select. I want the user to be able to preview each image on the site before upload. The JavaScript code below works for only one image but I would like …

HTML/Javascript Grade Average Calculation

I am currently writing a program in HTML/JavaScript and have been fighting it for several days with hours of research and studying without resolution. My program/site has a table that asks the user to enter their grades for 4 different categories. Then upon clicking the button to calculate the average it is s…

JSX with a HTML tag from a variable

I have a React component defined in JSX which returns a cell using either td or th, e.g.: Would it be possible to write the JSX in such a way that the HTML tag is taken from a variable? Like: The above code returns an error: “unexpected token” pointing at {. I am using Webpack with the Babel plugi…

Can’t set NODE_ENV=production with npm and webpack

I’m trying to access process.env.NODE_ENV inside my app, but I only get process is not defined when I check it. package.json: webpack.config.js: const NODE_ENV = process.env.NODE_ENV ? process.env.NODE_ENV.toLowerCase() : ‘development’; and below : In the app source: And it seems that proces…