1  export const arraySparseIndexes = (arr: unknown[]): number[] => {
 2  	const indexes: number[] = [];
 3  
 4  	for (let i = 0, length = arr.length; i < length; i++) {
 5  		if (!(i in arr)) {
 6  			indexes.push(i);
 7  		}
 8  	}
 9  
10  	return indexes;
11  };