Totalizer difference example

[bkenobi]

I changed my code to match your approach. I am not sure if the context is set to store to memory of file though. I have "file" in the set and get statements, but according to the guide I'm using, it looks like I may need to change the settings.js file?

A guide to understanding 'Persistent Context'

This is something I wrote up after playing with the context options. I've filed a PR with some of this added to the Node-RED documentation but thought I'd release it here also. I hope people find it useful. Paul A guide to understanding 'Persistent Context' Prior to Node-RED v0.19.0, data could be stored in context as a global, flow or node. This was stored in memory and would be reset with a restart of Node-RED. As of v.0.19.0 you can now store node, flow and global context data in memory O…

    contextStorage: {
    	default    : { module: "memory" },
		storeInFile: { module: "localfilesystem"},
		memoryOnly : { module: "memory" }
    },

Perhaps that's the default setting since I'm not seeing an error and it appears that the value is getting stored.