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const possibleNumbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]; const foo = (arr) => { let possibleNumCopy = [...possibleNumbers]; let arrCopy = JSON.parse(JSON.stringify(array)); let hollowCellsIndex = []; let usedNums = []; for (let i = 0; i < arr.length; i += 1) { for (let j = 0; j < arr[i].length; j += 1) { if (arr[i][j] === '-') hollowCellsIndex.push([i, j]); if (arr[i][j] !== '-') usedNums.push(arr[i][j]); } } let avalNums = possibleNumCopy.filter((el) => !usedNums.includes(el)); console.log(arrCopy[hollowCellsIndex[0][0]]) console.log(hollowCellsIndex[0]) }; console.log(foo(array));
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