We can use Object.fromEntries() method
to create an object containing
all the properties of a map.
In the example given above,
an object objectWithRandomProps
was created with all the key-value pairs
of the mapWithRandomProps map.
All the keys were converted into strings,
before adding them as a key in the object.
In the example above,
mapWithRandomProps has a key
which is an array [ 1, 2, 3, 4 ].
In objectWithRandomProps,
that key is converted to "1,2,3,4",
which is a string containing all the elements
separated by a comma.
All array keys behave the same way.
In the example above,
mapWithRandomProps has a key
which is an object { name: "Oliver" }.
In objectWithRandomProps,
that key is converted to "[object Object]".
All object keys behave the same way.
In the example give above,
mapWithRandomProps has two keys
that are of the object type.
Hence this is what happens
when the conversion from map
to object happens.
-
The { name: "Oliver" } key will be converted
to "[object Object]"
and
added to objectWithRandomProps.
So now,
objectWithRandomProps contains the property -
"[object Object]": "Property with object key".
-
The { age: 32 } key will also be converted
to "[object Object]"
and
added to objectWithRandomProps.
But since a property with that key
"[object Object]" was already added,
its value in objectWithRandomProps
will be updated to "Property with object key".