clear() {
        const hostSharedFormulaId = this._formulaRef && this._sharedFormulaId;

        delete this._value;
        delete this._formulaType;
        delete this._formula;
        delete this._sharedFormulaId;
        delete this._formulaRef;

        // TODO in future version: Move shared formula to some other cell. This would require parsing the formula...
        if (!_.isNil(hostSharedFormulaId)) this.sheet().clearCellsUsingSharedFormula(hostSharedFormulaId);

        return this;
    }
Clears the contents from the cell.
@returns {Cell} The cell.