Map - aizatto.com

Search…

Map

​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map​
Examples are in TypeScript.
Use function setters and getters
1
const map: Map<string, string> = new Map();
2
// Do not use []
3
// This is bad
4
map["key"] = "value";
5
​
6
// Do this instead
7
map.get(key, value);
Copied!
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​
1
var myMap = new Map();
2
myMap.set(0, 'zero');
3
myMap.set(1, 'one');
4
for (var [key, value] of myMap) {
5
  console.log(key + ' = ' + value);
6
}
7
// 0 = zero
8
// 1 = one
9
​
10
for (var key of myMap.keys()) {
11
  console.log(key);
12
}
13
// 0
14
// 1
15
​
16
for (var value of myMap.values()) {
17
  console.log(value);
18
}
19
// zero
20
// one
21
​
22
for (var [key, value] of myMap.entries()) {
23
  console.log(key + ' = ' + value);
24
}
25
// 0 = zero
26
// 1 = one
Copied!

fetch

Modules

Last modified 3yr ago

Copy link

Contents

Use function setters and getters

Iterating Map with for..of