In Javascript, what is an efficient way to transform Map keys into a Set without the need to copy and construct the set again?

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One efficient way to transform Map keys into a Set without copying and constructing the set again is by using the spread syntax.

Here's an example:

const myMap = new Map([
  ['key1', 'value1'],
  ['key2', 'value2'],
  ['key3', 'value3']
]);

const mySet = new Set([...myMap.keys()]);

console.log(mySet);
// Output: Set { 'key1', 'key2', 'key3' }

In this example, we use the spread syntax to create a new Set and pass in the keys of the Map using the keys() method. This avoids the need to create a new Set object and copy the values into it.