.map() a Javascript ES6 Map?

Question

How would you do this? Instinctively, I want to do:

var myMap = new Map([[\"thing1\", 1], [\"thing2\", 2], [\"thing3\", 3]]);

// wishful, ignorant thinking
         


        

Answer 1

You can use myMap.forEach, and in each loop, using map.set to change value.

myMap = new Map([
  ["a", 1],
  ["b", 2],
  ["c", 3]
]);

for (var [key, value] of myMap.entries()) {
  console.log(key + ' = ' + value);
}


myMap.forEach((value, key, map) => {
  map.set(key, value+1)
})

for (var [key, value] of myMap.entries()) {
  console.log(key + ' = ' + value);
}