How to assign a value to a specific object property in Array?

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I have an array with objects like this:

[{Date: null, Dossie1: null}, {Date: null, Dossie1: null}, {Date: null, Dossie1: null}]

And i need to assign to each specific objects property a value.

  let dataset = Array(dates.length).fill(objectTemplate)
  for (let i=0; i<dates.length; i++) {
    dataset[i].Date = dates[i]
  }

But the problem is that when i did it. Each object is assign with the last item. For instance if dates has 3 value [1,2,3]. Property in array dataset will be assign 3 not 1,2,3

reactjs javascript-objects arrays javascript
1 Answers

You can fill an array with a callback that returns a copy of the template (by using the spread operator).

Array.from({ length: dates.length }, () => ({ ...objectTemplate }))


const
  dates = [
    { Date: null, Dossie1: null },
    { Date: null, Dossie2: null },
    { Date: null, Dossie3: null },
  ],
  objectTemplate = { Date: null },
  dataset = Array.from({ length: dates.length }, () => ({ ...objectTemplate }));

for (let i = 0; i < dates.length; i++) {
  dataset[i].Date = dates[i];
}

console.log(dataset);
.as-console-wrapper { top: 0; max-height: 100% !important; }

user_17622240
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