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var setZeroes = function (matrix) {
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  let rows = new Array(matrix.length).fill(0); //to store the index of rows to be set to 0
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  let cols = new Array(matrix[0].length).fill(0); //to store the index of columns to be set to 0
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  for (let i = 0; i < matrix.length; i++) {
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    for (let j = 0; j < matrix[i].length; j++) {
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      if (matrix[i][j] === 0) {
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        //for zero value both row and column will be set to 0
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        rows[i] = 1;
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        cols[j] = 1;
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      }
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    }
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  }
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  for (let i = 0; i < matrix.length; i++) {
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    for (let j = 0; j < matrix[i].length; j++) {
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      if (rows[i] === 1 || cols[j] === 1) {
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        //if either row or col val is set, poulate it with 0
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        matrix[i][j] = 0;
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      }
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    }
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  }
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};