--- (1) ---
1
97
3
2

--- (2) ---
5
value associated with 'a string'
value associated with keyObj
value associated with keyFunc
value associated with 'a string'
undefined
undefined

--- (3) ---
not a number
not a number

--- (4) ---
0 = zero
1 = one
0
1
zero
one

--- (5) ---
0 = zero
1 = one

--- (7) ---
value1
[ [ 'key1', 'value1' ], [ 'key2', 'value2' ] ]
[ [ 'key1', 'value1' ], [ 'key2', 'value2' ] ]
[ 'key1', 'key2' ]

--- (8) ---
one
false

--- (9) ---
uno
dos
three

--- (10) ---
eins
dos
three

 --- (11) ---
Map(3) { 'apples' => 500, 'bananas' => 300, 'oranges' => 200 }

 --- (12) ---
Map(5) {
  'apples' => 500,
  'bananas' => 300,
  'oranges' => 200,
  'lemon' => 400,
  'lemson' => 600
}

 --- (13) ---
Map(8) {
  'apples' => 500,
  'bananas' => 300,
  'oranges' => 200,
  'lemon' => 400,
  'lemson' => 600,
  { name: 'Apples' } => 500,
  { name: 'Bananas' } => 300,
  { name: 'Oranges' } => 200
}

 --- (14) ---
3000

 --- (15) ---
applesbananasorangeslemonlemson[object Object][object Object][object Object]