mapa wypełnienia tablicy JS
let filledArray = new Array(10)
.fill(null)
.map(()=> ({'hello':'goodbye'}))
// In this approach, we are creating an array with ten empty slots,
// then filling those slots with the null value,
// then creating a new array with unique objects.
// Now when we change an object in the array,
// we are only changing a specific object, not a reference to an object.
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