Appending to an object

Question

I have an object that holds alerts and some information about them:

var alerts = { 
    1: { app: \'helloworld\', message: \'message\' },
    2: { app: \'hel         


        

Answer 1

As an alternative, in ES6, spread syntax might be used. ${Object.keys(alerts).length + 1} returns next id for alert.

let alerts = { 
    1: {app:'helloworld',message:'message'},
    2: {app:'helloagain',message:'another message'}
};

alerts = {
  ...alerts, 
  [`${Object.keys(alerts).length + 1}`]: 
  { 
    app: `helloagain${Object.keys(alerts).length + 1}`,message: 'next message' 
  } 
};

console.log(alerts);