How to get values from object without any "name"?

Question

I've got a piece of code in JS:

var commands = require('commands.json');
module.exports = class CatCommand extends commando.Command {
    constructor(client) {
        super(client, {
            name: 'cat',
            group: 'fun',
            aliases: commands[this.group][this.name].aliases || [utils.translate(this.name)],
            memberName: name,
            description: commands[this.group][this.name].description || 'No description',
            examples: commands[this.group][this.name].usages || ['No examples'],
            throttling: {
                usages: 2,
                duration: 5
            }
        });
    }

    async run(message) {}
}

I need to use variables name and group as commands' key. What's the best way to do that?

There is no way to refer to fields of an "under construction" object literal. If you need to use such values, make them values of separately-declared variables. — Pointy, Dec 26 '18 at 15:00

score 0 · Accepted Answer · answered Dec 26 '18 at 18:33

Since you're constructing that object, you can't get those properties (they technically don't exist yet).
Try declaring those values in a variable outside of the constructor, like this:

var name = "cat",
  group = "fun";

module.exports = class CatCommand extends commando.Command {
  constructor(client) {
    super(client, {
      name,
      group,
      aliases: commands[group][name].aliases || [utils.translate(name)],
      memberName: name,
      description: commands[group][name].description || 'No description',
      examples: commands[group][name].usages || ['No examples'],
      throttling: {
        usages: 2,
        duration: 5
      }
    });
  }
}

How to get values from object without any "name"?

1 Answers1