Add index of element in array to the element

[kmiesse]

How do I add the index of the element in an array to the element? I have the following doc that I simply want to add the index of the element in the array1 array to each element in the array1 array:
{
“field1”: “46”,
“array1”: [
{
“number”: 1,
“code”: “TSD”
},
{
“number”: 11,
“code”: “NONE”
}
]
}

Desired result:
{
“field1”: “46”,
“array1”: [
{
“number”: 1,
“code”: “TSD”,
“index”: 0
},
{
“number”: 11,
“code”: “NONE”,
“index”: 1
}
]
}

[nganapathiraju]

Look at this solution.

You can split the array and add snap.in.totalCount-1 as an index.

After splitting you need to reform the array and add the fields back together.

snap.in.totalCount-1 ==> $index in the mapper after JSON split

array index_2017_08_07.slp (8.8 KB)

[tstack]

kmiesse:

How do I add the index of the element in an array to the element?

The expression language is a functional subset of JavaScript, so often times you can search for the JavaScript solution to a problem and make some small changes to make it work.

In this case, you’ll want to use the ‘map()’ method on arrays to transform each element:

developer.mozilla.org

Array.prototype.map() - JavaScript | MDN

The map() method creates a new array populated with the results of calling a provided function on every element in the calling array.

The ‘map()’ method takes an arrow function that will be passed the element in the array and the index of that element. So, we can extend() the existing element to add in the index that is passed into the callback function.

The result looks like this:

$.array1.map((elem, elemIndex) => elem.extend({index: elemIndex}))

[kmiesse]

WOW! Thank you so much! It works wonderfully.