Convert Array Index into Matrix Index

Array2MatrixIndex.js

let matrix = Array.from(Array(100).keys());
let rows = 10, columns = 10;

let getRow = (index, totalRows) => {
  return Math.floor(index/totalRows);
}

let getColumn = (index, totalColumns) => {
  return index % totalColumns;
}

matrix.map((val, index) => {
  console.log('Index: ' + index, 'Row: ' + getRow(index, rows), 'Column: ' + getColumn(index, columns));
})