Can't work out how to pull array from attrib's

General
1

Hi all,

So I am stuck and can't seem to work out where to start on something, I have Octopus Agile, and I have the rates available to me in 30 minute blocks, I can get the data which are recorded as attributes as seen here:

image
image256Ă—734 6.72 KB

These are stored in msg.data.attributes, it looks like each price segment is it's own data entry, my goal is to parse them all and find the 3 lowest value entries and pass them on down the line, the issue I've got at the moment is parsing the dataset, I can't see to figure out a way to parse the entire attribute object in to an array to work it out, but I fear doing that it will have the date/time stamp there which will confuse the calculations in working out what is the cheapest time.

Anyone got any idea's please?

N/B the timestamps change so aren't constant so can't write a huge expression to calculate it them all.

2

There are a number of ways to approach this is one way: Object.entries() - JavaScript | MDN

Pass the msg.whatever.attributes object into Object.entries and you'll get an array of arrays ([key, value])

3

Cheers, I've read though that and I've managed to get it in to an array and find the lowest price, but it seems to kill the key so I can't see what time the price came from...

image

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4

Hi, Steve mentioned Object.entries(), so you have an array of arrays containing timestamp and price, you can then just sort() it. The first three indexes will be the lowest
With msg.payload[0][0] holding timestamp of lowest price and msg.payload[0][1] holding the lowest price.
e.g.

msg.data = {
    attributes: {
        one:3,
        two:4,
        three:1
    }
}
msg.payload = Object.entries(msg.data.attributes).sort((a,b) => a[1] -b[1]);

return msg;

Output

[
    [
        "three",
        1
    ],
    [
        "one",
        3
    ],
    [
        "two",
        4
    ]
]
1 Like
5

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