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Joining 2 arrays based on position and not a common ID

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Posted on 23 Jun 2022 16:57:21 by Mokono

I have exhausted looking for an answer so I am going to ask.

I have 2 arrays and I need to join them so that I can then have my table created from a single array and send it out. Here are the arrays:

Array1

Names from a name picker

{
 "Resource Name": "First Last"
}

2nd Array has a number that is a string input on the front end form but I convert to an array so it looks like this

{
"percent": "100"
}

The first array might have 1 or 20 names in it and the 2nd array will have the same number of items as the first array. I need to add the 2nd array to the first as a property so that it comes out like this:

[
 {
 "Resource Name": "First Last",
 "Percent Allocated": "100"
 },
 {
 "Resource Name": "First Last",
 "Percent Allocated": "50"
 }
]

How do I merge the arrays based on position of the items, for instance the 2nd array [0] goes to the first array [0] as a property and so on throughout the total number of items?

Thank you in advance!

Mokono

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Answers (1)

Mokono 4 on 23 Jun 2022 at 19:11:28

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Re: Joining 2 arrays based on position and not a common ID

In the append to array box, what is the expression you are using to pull in each of the different array items as it is cutoff in the screenshot.

eliotcole

4,266 Moderator on 23 Jun 2022 at 17:51:25

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Re: Joining 2 arrays based on position and not a common ID

Hi, @Mokono, there's quite a few answers here that might've helped you, but it can be done in a single step with a bit of creative expression writing!

Range That Is The Length Of Your Array Then Pick

So ... a quick and easy way to do this is to take the two arrays and then select them into one array, using a range() expression in its From field.

In my example, below, you will see that I am referencing my two 'mock' variables, here, but yours will be different references ... just change variables('arrayOneVAR') / variables('arrayTwoVAR') to point to your arrays:

From

range(
	0, 
	length(
		variables('arrayOneVAR')
	)
)

Map

Key	Value
Resource Name	`variables('arrayOneVAR')[item()]?['Resource Name']`
Percentage	`variables('arrayTwoVAR')[item()]?['percentage']`

What this does is:

Makes a range(), which is an array of numbers from the number before the comma, to the number afterwards.

Here, that second number is the amount of items in the array containing the Resource Name items.

This looks like this in my above example:
[ 0, 1, 2 ]
For each item in that range it then makes the appropriate Key/Value pairs.

Here you are using the item() (which is simply a number) to select an entry from the previous array.

So the first entry here is 0 that will select the Resource Name from entry 0 of arrayOneVAR:
variables('arrayOneVAR')[item(0)]?['Resource Name']

Hope this helps!

Verified answer

ScottShearer 25,236 Most Valuable Professional on 23 Jun 2022 at 17:45:30

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Re: Joining 2 arrays based on position and not a common ID

@Mokono

Here is one solution:

The end result looks like this (partial screen shot):

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Joining 2 arrays based on position and not a common ID

Range That Is The Length Of Your Array Then Pick

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