How to get JQ to retain comma separation between matched records in the output

I'm attempting to use windows cmder.exe (or standard command prompt) to execute jq commands for command-line JSON processor to transform and output existing JSON files I have saved. I've had success with returning data but now I'm curious about why there are no commas separating the matched records.

Given the the sample json

[
    {
      "name": "Bob",
      "location": "New York"
    },
    {
      "name": "Adam",
      "location": "Los Angeles"
    },
    {
      "name": "Jill",
      "location": "Chicago"
    }
]

When I retrieve matches for locations of New York and Los Angeles..

jq ".[] | select((.location == \"New York\") or select(.location == \"Los Angeles\"))" sample.json

I see the output:

{
  "name": "Bob",
  "location": "New York"
}
{
  "name": "Adam",
  "location": "Los Angeles"
}

My goal is interchangeably depending on my needs either (a) display results via the command line or (b) output to a new file such as

jq ".[] | select((.location == \"New York\") or select(.location == \"Los Angeles\"))" sample.json > newsample.json

So I need a fix in order to see the expected look below without physically changing the original sample.json file:

{
  "name": "Bob",
  "location": "New York"
},
{
  "name": "Adam",
  "location": "Los Angeles"
}

or even this if it's possible

[
  {
      "name": "Bob",
      "location": "New York"
  },
  {
      "name": "Adam",
      "location": "Los Angeles"
  }
]

Solution

.[] iterates the elements of an array and returns a stream of JSON entities. You cannot take a stream of JSON entities and claim its valid JSON: {"a":1},{"b":2} is not valid JSON nor a valid stream. [{"a":1},{"b":2}] is a valid JSON document containing a single array.

If you want to return an array, use map(f) to apply the filter f to every element in the array. map(f) is equivalent to [.[] | f] (and in fact implemented as such).

map(select(.location == "New York" or .location == "Los Angeles"))