List.getColumn

Get the values from a column in a multi-dimensional List (a List-of-Maps or a List-of-Lists).

If $indexKey is given, it will return a map in the form of { indexValue: columnValue, ... }.

// List of Maps (e.g. from `Db.selectRows`)
$users = [
    { id: 0, name: 'Bob' }
    { id: 1, name: 'Cat' }
    { id: 2, name: 'Ann' }
]

$users.getColumn('name')
//= ['Bob', 'Cat', 'Ann']


// With indexKey
$users.getColumn('name', 'id')
// {
//     0: 'Bob'
//     1: 'Cat'
//     2: 'Ann'
// }