Modified array of object with value from a given object TS/JS

Question

Guys what is the best approach to modified array of object with value from object. E.g: lets say that we have array and object like this:

let arr = [
{
        parameter: 'aaa', 
        isSomething: false
},
{
        parameter: 'bbb', 
        isSomething: false
}, 
{
        parameter: 'ccc', 
        isSomething: false
}
];

let obj = {aaa: false, bbb: true, ccc: true}

and output that I want to achieve is:

let arr = [
{
        parameter: 'aaa', 
        isSomething: false
},
{
        parameter: 'bbb', 
        isSomething: true
}, 
{
        parameter: 'ccc', 
        isSomething: true
}
];

Could you help me with this one? I would be grateful. Thanks

What exactly is the purpose of the first array? It seems like you just want to create an array based on the entries of obj - I don't understand what you need the first array for — UnholySheep
– UnholySheep, Commented May 18, 2022 at 10:14
Have you tried using a simple for loop? Something like arr.forEach(item => item.isSomething = obj[item.parameter]) should work — adiga
– adiga, Commented May 18, 2022 at 10:14

Yosvel Quintero · Accepted Answer · 2022-05-18 10:18:31Z

2

You can use Arra#map() combined with Destructuring assignment

Code:

const arr = [{parameter: 'aaa',isSomething: false},{parameter: 'bbb',isSomething: false},{parameter: 'ccc',isSomething: false}]

const obj = {
  aaa: false,
  bbb: true,
  ccc: true
}

const result = arr.map(({ parameter, isSomething }) => ({ 
  parameter, 
  isSomething: obj[parameter]
}))

console.log(result)

answered May 18, 2022 at 10:18

Yosvel Quintero

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