Getting the values for a specific key from all objects in an array

Question

I\'m running an express.js app that has a few apis feeding data to dropdown boxes. The data returned is in the form:

  [
    {
        key: \'blah\',
                


        

Answer 1

You could map:

permittedValues = array.map(function(value) {
  return value.key;
});

In ES6/ES2015 it's even prettier with arrow functions:

permittedValues = array.map(value => value.key);

It might be prettier, but it's probably not faster than a for() loop.