verifying if the records are same and incrementing the count

a!localVariables(
  local!data: {
    { name: "Test1", id: 1 },
    { name: "Test1", id: 2 },
    { name: "Test2", id: 3 },
    { name: "Test1", id: 1 }
  },
  a!forEach(
    local!data,
    a!map(
      id: property(fv!item, "id", null),
    pid: 
      concat(
      property(fv!item, "name", null),
      substitute(padleft(
        length(tointeger(wherecontains(
          tostring(property(fv!item, "name", null)),
          touniformstring(property(index(local!data,enumerate(fv!index)+1,{}),"name", null))
        ))),
        3)," ",0)
      )
    )
)
)

This will return the data as per your requirement.

a!localVariables(
local!data: {
{ name: "Test1", id: 1 },
{ name: "Test1", id: 2 },
{ name: "Test2", id: 3 },
{ name: "Test1", id: 1 }
},
a!forEach(
local!data,
a!map(
id: property(fv!item, "id", null),
pid:
concat(
property(fv!item, "name", null),
substitute(padleft(
length(tointeger(wherecontains(
tostring(property(fv!item, "name", null))&tostring(property(fv!item,"id",null). ---> this returns length zero   
touniformstring(property(index(local!data,enumerate(fv!index)+1,{}),"name", null))
))),
3)," ",0)
)
)
)
)

It will evaluate to zero when name and id fields are not present for a particular index

It will evaluate to zero when name and id fields are not present for a particular index