Can someone help? I need a simple array humidityArray with 24 values. Every hour I would move offset 22 value into offset 23, 21 into 22 etc.... and put latest value into offset zero... so I would always be able tot total all 24 values once a day and didide that by 24 to give me the daily average hu…

Hi there Unshift work a treat.. I don’t worry about resizing the local array as it gets recreated every time I call the function and I just use the first 24 values. The challenge of sticking with the global still alludes me. How would you use unshift with the GLOBAL array? Let’s say you were poking…

[image] scargill: How would you use unshift with the GLOBAL array? The only operations we provide are get and set. To modify a value in context you have to get it, modify it and then set it back. That's it. Can you provide some code that shows (even if it doesn't work) what you think you wan…

Global.get and set, that is how I always use global vars

global.set(“blim”,[]); for (var a=0 a<10;a++) global.set(“blim[“ + a + “]”,-1); It really doesn’t get any simpler. THAT much WORKS – Just done it. I set up the entire array with value -1 without issue, one part at a time. However, adding in a little extra KILLS NODE-RED – the only way out is a r…

When I say it works, it may actually do some damage as after all of the above I lost all my NR credentials. Thank heavens for backups.

[image] scargill: for (a=0;a<10;a) global.set("blim[" + a + "]",-1); You killed Node-RED by not incrementing a in this for loop - causing it to loop forever.

Oh, good grief – you are of course absolutely right Nick – my apologies. Ok that works. Back to how to unshift and pop Hence below works except for the unshift line. I tried a couple of variations.. var a; global.set("blim",[]); for (a=0;a<10;a++) global.set("blim[" + a + "]",-1); msg.payload="…

@scargill the first argument you pass to get is the name of the property you want to get back from context. Whilst you can include array-indexes in the name (such as blim[10]), you cannot include a javascript function in the name of the property and expect it to do anything. "blim.unshift(67)" is n…

[image] knolleary: global.set("blim",global.get("blim").unshift(67)); I don't think it will work because unshift() returns the array length.

Global numeric array trouble using global get and set

General

scargill 24 July 2018 08:04 40

As is becoming apparent, NR has no protection against abuse of global vars and apparently just gives up and dies when that happens.

I just gave an example that killed ny NR setup.

Pete

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Global numeric array trouble using global get and set

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