Baseline Widely available
The size accessor property of Map instances returns the number of elements in this map.
const map1 = new Map();
map1.set("a", "alpha");
map1.set("b", "beta");
map1.set("g", "gamma");
console.log(map1.size);
// Expected output: 3
The value of size is an integer representing how many entries the Map object has. A set accessor function for size is undefined; you can not change this property.
const myMap = new Map();
myMap.set("a", "alpha");
myMap.set("b", "beta");
myMap.set("g", "gamma");
console.log(myMap.size); // 3
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