Returing just the value from an array of objects-CodePudding

So I am running a NodeJS Serverless instance, using Knex.js as my DB middleware. When attempting to return JUST the value from a request to Knex, I always get [ { vrn: 'xx12xyz' } ]. I have tried using Object(), does anyone have a quick one liner or small helper function that can help me flatten this into a direct array such that I can pick out JUST the value?

This is the code I am using:

const vrnList = await db('vehicles').select('vrn').where('id', '=', '1');
    console.log("The quick car with the VRN ", Object.values(vrnList), " overtook me on the freeway");

TL;DR: Splitting the object and array id from the values

CodePudding user response：

Try this one:

let onlyValues = vrnList.map(result => result.vrn);

CodePudding user response：

Since the OP seems to retrieve the value(s) key agnostic via Object.values which returns an array of values, the OP in addition needs to utilize flatMap ...

console.log(
  [{ vrn: 'xx12xyz' } ].flatMap(item => Object.values(item))
);
console.log(
  [
    { vrn: 'xx12xyz' },
    { vrn: 'xx98abc' },
    { vrn: 'yy34xyz' },
  ].flatMap(item => Object.values(item))
);

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