add to map javascript

1var myMap = {};
2
3myMap[newKey] = newValue;
4
5// ...
6
7
8// Another method
9
10var myMap = new Map()
11myMap.set("key0","value")
12// ...
13myMap.has("key1"); // evaluates to false, assuming key1 wasn't set

1function listFruits() {
2  let fruits = ["apple", "cherry", "pear"]
3  
4  fruits.map((fruit, index) => {
5    console.log(index, fruit)
6  })
7}
8
9listFruits()
10
11// https://jsfiddle.net/tmoreland/16qfpkgb/3/

1const numbers = [0,1,2,3];
2
3console.log(numbers.map((number) => {
4  return number;
5}));

1// Works with Vue Reactive hooks
2var myMap = new Map()
3myMap.set("key0","value")