Could someone explain how this [...Array(10).keys()]; working and logging 0 to 9 index?
console.log([...Array(10).keys()]);Here is the explanation
Case-1
const string = 'hello';
const array = [...string];
array;
// [ 'h' , 'e', 'l', 'l', 'o' ]
Case-2
Where we see spread operator acting as an eraser
[
...[1, 2, 3] // The dots erases the brackets
]
/* Becoming this: */
[
1, 2, 3 // "Erased"
]
Combining both of the above cases will help you on whats happening