Help return array index

[agermansen]

Hey all

I got this fairly simple flow that takes in an array of todays energi prices and returns the minimum and maximum value, this is all well and good but i need to know when the prices are high and low, can anyone help me get the index number out with the value ?

bonus question!
It doesn't help me a lot to wake up in the morning and see the the cheepest time to starte the washer was 3 hours ago, is there any way to compare the index number to the hour of the day and only look through index numbers equal to og higher ?

Thanks

ps. this is my first question here, if i f-ed up the format pls let me know.

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[E1cid]

Your flow.json is corrupt it needs to be posted between triple backticks
e.g.
```
code
```
As to min max and index , you have not given an example of the array, so i can only give you an example of a simple array, and how to search for min /max and their index.

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let min = {value: msg.payload[0], index:0};
let max = {value: msg.payload[0], index:0};
msg.payload.forEach((int, index) =>{
    if(int > max.value) max = {value: int, index: index};
    if(int < min.value) min = {value: int, index: index};
})
msg.payload = {min, max};
return msg;

[agermansen]

thanks a bunch

with just the payload changed to data.attributes.today i got exactly what i wanted

an example of the array could just be this, the index numbers are hours of the day and the value is the price of a kWh

have you got any ideas on getting the index number compared to the current hour so i can get the upcomming cheepest price ?

[E1cid]

Then get the hour of day and only look at indices above or equal to the hour.

const hour = new Date().getHours()
let min = {value: msg.payload[hour], index:hour};
let max = {value: msg.payload[hour], index:hour};
msg.payload.forEach((int, index) =>{
    if(index >= hour){
        if(int > max.value) max = {value: int, index: index};
        else if(int < min.value) min = {value: int, index: index}
    }
})
msg.payload = {min, max}
return msg;

Or to minimise the loop and start search at hour index ( not that this small loop really matters)

let search_array = msg.payload;
let index = new Date().getHours();
let min = {value: search_array[index], index: index};
let max = {value: search_array[index], index: index};
for(index; index < 24; index++){
    let int = search_array[index];
    if(int > max.value) max = {value: int, index: index};
    else if(int < min.value) min = {value: int, index: index}
}
msg.payload = {min, max}
return msg;

[agermansen]

everything is working now, thanks a lot