Formula to JSON

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Define formula using variables and transform it to JSON if it’s a valid math expression using Math.js

Formula validator

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Define formula using variables and check if it’s a valid math expression using Math.js

Allow markers only within an area

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Map area for your makers using a polygon.

This was used as a challenge during one of our selection processes.

Resize HTML5 Canvas without losing drawing

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There are multiple ways to resize a canvas without losing its content. One of the easiest way is to save its data.

Best way to install Node.js and NPM

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Node.js strongly recommend using a Node version manager like n to install Node.js and npm. They do not recommend using a Node installer, since the Node installation process installs npm in a directory with local permissions and can cause permissions errors when you run npm packages globally.

Install n directly from Github:

curl -L https://bit.ly/n-install | bash

Then check your versions (remember than node comes with npm)

node --version && npm --version

Note: if you are already having problems, first remove everything related with Node.js and NPM