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This is some of the formattedResults (there are 60 results)

{
    "statusCode": "200",
    "time": "2022-12-07 10:24:00.000",
    "count": "3"
}


This is part of the code, seems to be an issue with the last line of code.

let labels = {}
let data
for (let index in formattedResults) {
    data = formattedResults[index]

    if (!labels[data.statusCode]) {
        labels[data.statusCode] = [...Array(61).keys()].map(i => 0)
    }

    labels[data.statusCode][(new Date(formattedResults.time).getTime() - 1670405100000) / 60000] = formattedResults.count
}


What I have tried:

When I try to run this in the console it says 'undefined', I'm expecting it to form a new array with all the different status codes and the counts for each minute.
Posted
Updated 14-Dec-22 3:29am

1 solution

Quote:
JavaScript
[...Array(61).keys()].map(i => 0)
That seems like a horribly inefficient method to produce a 61-element array of zeros. You create a new array, iterate over its keys, create a new array from that, then create a third array mapping each entry to zero.

You could simplify that to:
JavaScript
labels[data.statusCode] = Array(61).fill(0);
which only allocates a single array.

Quote:
JavaScript
(new Date(formattedResults.time).getTime() - 1670405100000) / 60000
Firstly, you're looking for a time property on the formattedResults array; you should be accessing the data variable instead.

Secondly, unless your time is always rounded to the nearest minute, that will return a floating-point number. If you want to use that as an index into your array, you need to round or truncate it.
JavaScript
Math.floor((new Date(data.time).getTime() - 1670405100000) / 60000)

You then have the same problem with the count - you're looking on formattedResults instead of data.

The fixed code:
JavaScript
let labels = {};
for (let index in formattedResults) {
    let data = formattedResults[index];

    if (!labels[data.statusCode]) {
        labels[data.statusCode] = Array(61).fill(0);
    }
	
	let s = Math.floor((new Date(data.time).getTime() - 1670405100000) / 60000);
    labels[data.statusCode][s] = data.count;
}
Demo[^]
 
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