a
a
aizatto.com
Build.my
GitHub
Linkedin
Notion
Search…
aizatto.com
Table of Contents
Portfolio, Projects, Tools, Toys
Interview Guide
Engineering Code
Engineering Management
Why GitBook?
Getting into Tech
Personal Goals
Daily Drivers
Contacting Me
Notes
AWS
JavaScript
Array
Async & Await / Promises
Booleans
Collections
Cons/Dislikes
fetch
Map
Modules
Object
Regex
Set
Style Guides
Versions
Node.js
Software Engineering
Technical Due Diligence
Web Development
Archive
More on Notion
Powered By
GitBook
Map
​
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
​
Examples are in TypeScript.
Use function setters and getters
const
map
:
Map
<
string
,
string
>
=
new
Map
();
// Do not use []
// This is bad
map
[
"key"
]
=
"value"
;
​
// Do this instead
map
.
get
(
key
,
value
);
Iterating
Map
with
for..of
Taken from
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map#Iterating_Map_with_for..of
​
var
myMap
=
new
Map
();
myMap
.
set
(
0
,
'zero'
);
myMap
.
set
(
1
,
'one'
);
for
(
var
[
key
,
value
]
of
myMap
)
{
console
.
log
(
key
+
' = '
+
value
);
}
// 0 = zero
// 1 = one
​
for
(
var
key
of
myMap
.
keys
())
{
console
.
log
(
key
);
}
// 0
// 1
​
for
(
var
value
of
myMap
.
values
())
{
console
.
log
(
value
);
}
// zero
// one
​
for
(
var
[
key
,
value
]
of
myMap
.
entries
())
{
console
.
log
(
key
+
' = '
+
value
);
}
// 0 = zero
// 1 = one
Previous
fetch
Next
Modules
Last modified
3yr ago
Copy link
On this page
Use function setters and getters
Iterating Map with for..of