Set.prototype.filter

• Added to make all collections similar in capabilities. Should mimic Array.prototype.filter as close as reasonable.

Set.prototype.map

• Added to make all collections similar in capabilities. Should mimic Array.prototype.map as close as reasonable.

Set.prototype.find

• Added to make all collections similar in capabilities. Should mimic Array.prototype.find as close as reasonable.
• Problematic behaviour

Set.prototype.reduce

• Added to make all collections similar in capabilities. Should mimic Array.prototype.reduce as close as reasonable.
• Static linters can check if function used by Set.prototype.reduce is associative and commutative. Otherwise, results can be surprising to user.

Set.prototype.join

• Added to make all collections similar in capabilities. Should mimic Array.prototype.join as close as reasonable.

Set.prototype.some

• Added to make all collections similar in capabilities. Should mimic Array.prototype.some as close as reasonable.

Set.prototype.every

• Added to make all collections similar in capabilities. Should mimic Array.prototype.every as close as reasonable.

Set.prototype.addAll

• Set.prototype.add can't be extended due to pattern of arr.forEach(set.add, set) and arr.forEach(set.add.bind(set)).
• Doesn't create new set like Set.prototype.union

Set.prototype.deleteAll

• Set.prototype.delete can't be extended due to pattern of arr.forEach(set.delete, set) and arr.forEach(set.delete.bind(set)).

Map prototype methods

Map.prototype.filter

• Added to make all collections similar in capabilities. Should mimic Array.prototype.filter as close as reasonable.

Map.prototype.mapValues

TBA

Map.prototype.mapKeys

TBA

Map.prototype.reduce

• Added to make all collections similar in capabilities. Should mimic Array.prototype.reduce as close as reasonable.

Map.prototype.find

• Added to make all collections similar in capabilities. Should mimic Array.prototype.find.
• This methods find value and returns it. It can be reasonable to return pair [key, value] or merge it with findKey.

Map.prototype.findKey

• This methods find value and returns its key. It can be reasonable to return pair [key, value] or merge it with find.

Map.prototype.keyOf(searchElement)

• This methods returns first key where SameValueZero(p.[[Value]], searchElement) is true.

Map.prototype.some

• Added to make all collections similar in capabilities. Should mimic Array.prototype.some as close as reasonable.

Map.prototype.every

• Added to make all collections similar in capabilities. Should mimic Array.prototype.some as close as reasonable.

Map.prototype.includes

• Added to make all collections similar in capabilities. Should mimic Array.prototype.includes as close as reasonable.

Map.prototype.update

TBA

Map.prototype.deleteAll

TBA

Map.prototype.merge

TBA

Map static methods

Map.groupBy

TBA

Map.keyBy

TBA