Callable Map
A callable map is a type of callable class. In this case it's a Map() class that can be called as a function. It can be created in the following ways.
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Once created you can use it as a function. The callable map will return the value of the key passed as an argument. If the key does not exist in the map, it will return undefined.
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size
Returns the number of key/value pairs in the map. This is the same as the length property for arrays.
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clear()
Clears the map. This will remove all the keys and values from the map.
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delete()
Deletes the key/value pair from the map. If the key does not exist in the map, it will do nothing.
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entries()
Returns an iterator object that contains the key/value pairs for each element in the map.
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forEach()
Calls a function for each key/value pair in the map. The function is called with the value, key and the map itself as arguments.
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get()
Returns the value associated with the key. If the key does not exist in the map, it will return undefined.
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has()
Returns true if the key exists in the map, otherwise it will return false.
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keys()
Returns an iterator object that contains the keys for each element in the map.
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set()
Returns an iterator object that contains the keys for each element in the map.
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values()
Returns an iterator object that contains the values for each element in the map.
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