Memory Requirements

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There is a difference between the memory required to store a key value and the memory consumed in the process. For JavaScript, consumption is doubled that of storage.

The following table illustrates memory storage and consumption, for both a key name and its value, as well as the available methods for determining each:

Prefix	Example	Key Name	Key Memory Storage keybytes	Full Key Memory Storage⑴ keybytesall	Full Key Memory Consumed keybytesmem	Data Type	Data Value	Internally Stored As	Value Memory Storage valbytes	Full Value Memory Storage⑵ valbytesall	Full Value Memory Consumed valbytesmem
lds-1.	.set( 'skey1', '["x"]' )	skey1	5 bytes	11 bytes	22 bytes	Array	["x"]	["x"]�	5 bytes	6 bytes	12 bytes
☝	.set( 'skey1', 12n )	☝	☝	☝	☝	BigInt	12n	12�	2 bytes	3 bytes	6 bytes
☝	.set( 'skey1', true )	☝	☝	☝	☝	Boolean	true	1�	1 byte	2 bytes	4 bytes
☝	.set( 'skey1', false )	☝	☝	☝	☝	Boolean	false	0�	1 byte	2 bytes	4 bytes
☝	.set( 'skey1', Date() )	☝	☝	☝	☝	Date	~	ZVRnbZS�	7 bytes	8 bytes	16 bytes
☝	.set( 'skey1', 19.99 )	☝	☝	☝	☝	Float	19.99	19.99�	5 bytes	6 bytes	12 bytes
☝	.set( 'skey1', 1234 )	☝	☝	☝	☝	Integer	1234	1234�	4 bytes	5 bytes	10 bytes
☝	.set( 'skey1', null )	☝	☝	☝	☝	null	null	null�	4 bytes	5 bytes	10 bytes
☝	.set( 'skey1', {'a':1} )	☝	☝	☝	☝	Object	{'a':1}	{'a':1}�	7 bytes	8 bytes	16 bytes
☝	.set( 'skey1', 'lds' )	☝	☝	☝	☝	String	'lds'	lds�	3 bytes	4 bytes	8 bytes
☝	.set( 'skey1', 'test string' )	☝	☝	☝	☝	Compressed String	'this is some string data'	\x9B8\x17³l>ÃF¥'þa�⑷	17 bytes	18 bytes	36 bytes⑶

Footnotes:
⑴ includes the namespace prefix (6 bytes, in this example)
⑵ includes the data type marker flag (always 1 byte)
⑶ text compression—even on a small scale—makes an impact (uncompressed this string would consume 24 bytes, not 17)
⑷ note that the length of the string is inconsequential (13 in this case); for storage the only metric that counts is the byte count