getNumberValueCount.js

function getNumberOfGroupsAssignedForNumber(number, groups) {
  return groups.reduce((accumulator, row) =>
    accumulator + (row.get(number) > 0 ? 1 : 0), 0);
}
class Game extends Compoent {
...  
  // get the min between its completion in rows, columns and squares.
  getNumberValueCount(number) {
    const rows = this.state.board.getIn(['choices', 'rows']);
    const columns = this.state.board.getIn(['choices', 'columns']);
    const squares = this.state.board.getIn(['choices', 'squares']);
    return Math.min(
      getNumberOfGroupsAssignedForNumber(number, squares),
      Math.min(
        getNumberOfGroupsAssignedForNumber(number, rows),
        getNumberOfGroupsAssignedForNumber(number, columns),
      ),
    );
  }
...
}