ecmascript 6 - Is there a functional way to init an array in JavaScript ES6?

Question

I finally gave up and wrote a for loop to initialize a simple array of objects where each object has an incremented counter (id) as an attribute of the object. In other words, I just want:

var sampleData = [{id: 1},{id: 2},...];

I was hoping for a compact syntax I could just put on my return statement.

let sampleData = [];
for (var p = 0; p < 25; p++){
    sampleData.push({id: p});
}

return {
    data: sampleData,
    isLoading: true
};

Answer 1

Array.from() is a nice way to do this. You can pass a {length: somlength} object or some other array-like object and a function that defines each item. The first argument (calling it _ just to indicate it's not used) to that function would be the item from an array we passed in (but we only passed in a length so it doesn't mean much), the second i is the index, which is used for your id:

let sampleData = Array.from({length: 10}, (_, id) => ({id}))

console.log(sampleData)