Support it keyword in map function

[patelhumaira21]

Is your feature request related to a problem? Please describe.
I have an array of objects like below

[ 
  {...},
  {...}
  ...
]

I want to map it to a new array like below

[
  { "someKey" : {...} },
  { "someKey" : {...} },
  ...
]

It is not possible to perform such a transformation using the map method.

Describe the solution you'd like

Below is an example of pickFIrst function usage.

pickFirst(a,b,c -> it != null)

It already has a concept of it reference, which is a self-reference to the current object while iterating over a,b and c.

We can apply this concept to the map function so that the above transformation can be achieved by

map(myArray -> {
  someKey = it
 })

Describe alternatives you've considered
None of the supported functions support this usecase

Additional context

[shreyagajane]

I will be working on this issue