JavaScript Map - setting nested properties

Question

I have this Map

let map = new Map(Object.entries({
   a: 1,
   b: {
        c: 2,
        method() {console.log('test')}
      }
   }
));

Now, I want to change map.b.method. How can I achieve that?

@UnknownJoe map.set('b', { ...map.get('b'), method() { … } }) — Andrew Li
– Andrew Li, Commented Jul 16, 2018 at 16:21
A Map is, and I'm being really broad here, basically just an Object that allows you to use things other than Strings as keys. How would you do this with a regular Object? Start there and tell us what issues you run into. — zero298
– zero298, Commented Jul 16, 2018 at 16:22

Ruan Mendes · Accepted Answer · 2018-07-16 20:39:17Z

6

It's just an object stored inside the map. Get a reference to it and modify it as you'd like.

let map = new Map(Object.entries({
  a: 1,
  b: {
    c: 2,
    method() {
      console.log('test')
    }
  }
}));

map.set('b', {
  ...map.get('b'),
  method: function() {
    console.log('It works ;)');
  }
});

map.get('b').method();

edited Jul 16, 2018 at 20:39

Ruan Mendes

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answered Jul 16, 2018 at 16:20

Murillo de Morais

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