JS / ES6在map.get中引用一个常量

Question

Is it possible to use a constant instead of a key from a map as long as the constant's value equals a key from the map?

const myColor = 'dark';
const myMap = new Map();

myMap.set('dark', {
  primary: '#000',
});

const myValues: {
  first: myMap.get(myColor).primary,
}
                   ^ This should output to 'dark' and access the primary key.

Answer 1

Is it possible to use a constant instead of a key from a map as long as the constant's value equals a key from the map?

Yes, you can use any variable as the key as long as its value is === to the original key. const or no const does not make a difference for a Map key.

---

Also, in your myValues declaration, it should be this:

const myValues = {
  first: myMap.get(myColor).primary,
}

where you use = instead of : .

Answer 2

yes, your only problem is that your syntax is off.

const myColor = 'dark';
const myMap = new Map();

myMap.set('dark', {
  primary: '#000',
});

const myValues = {
  first: myMap.get(myColor).primary,
}