Loop through an array by a value in another array to create a different array

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Posted on by Cgangweg01

876 Super User 2026 Season 1

Hello -

I've tried different 'apply to each' scenarios without luck for the following.

I want to loop through array 1 by zone using value zone number in array 2 and create array 3.

Array 1

[
{
"Zone": "1",
"LookUpStr": "25"
},
{
"Zone": "2",
"LookUpStr": "35"
},
{
"Zone": "3",
"LookUpStr": "80"
},
{
"Zone": "4",
"LookUpStr": "45"
},
{
"Zone": "5",
"LookUpStr": "157"
}

]

Array 2

[
{
"Zone Number": 2
},
{
"Zone Number": 3
},
{
"Zone Number": 4
}
]

Array 3 created by flow

[

{
"LookUpStr": "35",

"LookUpStr": "80",

"LookUpStr": "45"
}

]

Appreciate any suggestion.

Thanks!

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Building flows

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi @Cgangweg01

Try this approach without using loop :)

1. use 2 initialize variables to initialize array 1 and array 2 as shown below

2. use compose action to format the Array 2 as shown below

3. Use filter array to get required values

Expression:

xpath(xml(outputs('Format_Array2')),concat('//Zone_x0020_Number/text()=','''',item()?['Zone'],''''))

4. use select action to select LookUpStr property from output of filter array

see the output of select action

Thanks & Regards,
Nived N

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Cgangweg01 876 Super User 2026 Season 1 on at

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Thank you! @Nived_Nambiar

That worked! I was even able to use the output in an apply to each to make an API call per LookUpStr number. Awesome! Now I need to figure out how to compile each API call result into a single array for further filtering.

Also wondering ... could you explain what the xpath expression is actually doing?

xpath(xml(outputs('Format_Array2')),concat('//Zone_x0020_Number/text()=','''',item()?['Zone'],''''))

Thanks Again!

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