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I need some help to optimize algorithm. I have a matrix of sprites and I am highlighting a part of it. It can be rectangle or square it doesn't matter. I need to hide all sprites of this matrix that do not belong to the given area. I have this function which is highly non-optimized i.e 4 nested "for" cycles: hideMatrixArea: function(slotTwoDimArray, row, col, numRows, numCols) { var i = 0, j = 0, k = 0, t = 0, matrixWidth = slotTwoDimArray.length, matrixHeigth = slotTwoDimArray[0].length; for (i = 0; i < matrixWidth; i += 1, k += 1) { for (j = 0; j < matrixHeigth; j += 1, t += 1) { for (k = row; k < row + numRows; k += 1) { for (t = col; t < col + numCols; t += 1) { if (!(k === i && t === j)) { console.log("hello"); this.hideSlot(slotTwoDimArray, i, j); } } } } } return slotTwoDimArray; }, It prints "hello" 15600 times which is a lot. How can I hide slots that are not in the space (row, col) -> (row + numRows, col + numCols) i.e the inverse without using nested "for" loops? Any ideas?