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MAPS (let users = new Map(); (users.set('john', john) (to (users),…
MAPS
let users = new Map();
users.set('john', john)
fetch
object
to
users
Map object
read
documentation
users.size
prednost
users.get(key)
users.get('john')
users.keys()
iterate
all
MapIterator
differences
with
objects
1.
key
can be
any
type
2.
keys
ordered
3,
size
4.
iterable
for (const key of users.keys()){console.log(key)}
for of
for (const value of users.values()) {console.log(value.name)}
for (const [key, value] of users.entries()) {console.log(key + ' ' + value.name)}
basics
holds
key
value
pairs
iterable
obj
good
for
nosql
databases
mongo
firebase
loops
users.forEach((value, key) => console.log(key + ' ' + value.name))
strange
class
let john = {name: 'i am john'}