Typescript/Javascript: Setting a unique list with an additional property

Question

I have the following empty array declared:

  myYears: { year: number, checked: boolean }[] = [];

My goal is to fill this array of objects with a year and a boolean on whether or not that year is checked. I like having the property names here as well. When initially populating myYears, I fill it like below to obtain my list of unique years from myBigDataList object array. This is successful in giving me an array of unique year numbers, and I've gotten this far. Now what's the best way to turn this into an array of {year: number, checked: boolean} objects instead of just numbers, and where everything is initialized to true?

  this.myYears= Array.from(new Set(this.myBigDataList.map(item => {item.activityYear})));

Will · Accepted Answer · 2017-07-06 01:12:20Z

1

You can do it in your map function.

let myYears = [
  1971,
  1972,
  1973
];

myYears = myYears.map(year => {
  return {
    year: year,
    checked: true
  };
});

console.log(myYears);

answered Jul 6, 2017 at 1:12

Will

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2 Comments

Andy Over a year ago

Actually, this doesn't quite work as now it's not returning a unique array by year. If I add in an extra 1971 for example, I only want one of them returned.

Will Over a year ago

Ah. Then do the map after you make the unique array. Map 'this.myYears' and have each element of the array return an object.

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