The @microsoft/sp-property-pane package does not provide a PropertyPaneDatePicker control. If you're looking to add a date picker in the property pane of an SPFx web part, you can use the PropertyPaneCustomField control and integrate a third-party date picker component.

Here's an example of how you can use the PropertyPaneCustomField to add a date picker using the office-ui-fabric-react library:

1. Install the required packages:

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npm install office-ui-fabric-react

2. Import the necessary modules in your web part's TypeScript file:

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import * as React from 'react';
import * as ReactDom from 'react-dom';
import { PropertyPaneCustomField } from '@microsoft/sp-property-pane';
import { DatePicker } from 'office-ui-fabric-react/lib/DatePicker';
import { IDatePickerProps } from 'office-ui-fabric-react/lib/DatePicker';

3. Create a custom property pane field component for the date picker:

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export class DatePickerField implements IPropertyPaneField<any> {
  private elem: HTMLElement;
  private properties: any;
  private targetProperty: string;
  private onPropertyChange: (propertyPath: string, newValue: any) => void;
  private customProperties: any;

  constructor(elem: HTMLElement, properties: any, onPropertyChange: (propertyPath: string, newValue: any) => void, targetProperty: string, customProperties?: any) {
    this.elem = elem;
    this.properties = properties;
    this.onPropertyChange = onPropertyChange;
    this.targetProperty = targetProperty;
    this.customProperties = customProperties;
  }

  public render(): void {
    const element: React.ReactElement<IDatePickerProps> = React.createElement(DatePicker, {
      label: this.customProperties.label,
      value: this.properties[this.targetProperty],
      onSelectDate: this.onDateChanged,
    });

    ReactDom.render(element, this.elem);
  }

  private onDateChanged = (date: Date): void => {
    this.properties[this.targetProperty] = date;
    this.onPropertyChange(this.targetProperty, this.properties[this.targetProperty]);
    this.render();
  }

  // Other required methods from IPropertyPaneField
}

4. In your web part's property pane configuration, use the PropertyPaneCustomField to add the date picker:

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protected getPropertyPaneConfiguration(): IPropertyPaneConfiguration {
  return {
    pages: [
      {
        header: {
          description: 'Custom Fields'
        },
        groups: [
          {
            groupName: 'Settings',
            groupFields: [
              PropertyPaneCustomField({
                targetProperty: 'selectedDate',
                onRender: (elem: HTMLElement): void => {
                  if (this.context.propertyPane.isRenderedByWebPart()) {
                    const datePickerField: DatePickerField = new DatePickerField(elem, this.properties, this.onPropertyPaneFieldChanged, 'selectedDate', { label: 'Select a date' });
                    datePickerField.render();
                  }
                }
              })
            ]
          }
        ]
      }
    ]
  };
}

5. Make sure to update your web part's interface to include the selectedDate property:

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export interface IYourWebPartProps {
  selectedDate: Date;
}

With these steps, you have added a custom date picker field to your web part's property pane using the PropertyPaneCustomField control and the office-ui-fabric-react library.

1. Create a new state variable that will hold the updated array.
2. Use the map() function to iterate through the original array and update the values in the corresponding columns.
3. Update the state variable with the new array.

Here's an example of how you can update an array with four columns:

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import React, { useState } from 'react';

function App() {
  const [data, setData] = useState([
    [1, "John", "Doe", 30],
    [2, "Jane", "Smith", 25],
    [3, "Bob", "Johnson", 40]
  ]);

  const updateData = (id, column, value) => {
    setData(data.map(row => {
      if (row[0] === id) {
        return [
          row[0],
          column === 1 ? value : row[1],
          column === 2 ? value : row[2],
          column === 3 ? value : row[3]
        ];
      } else {
        return row;
      }
    }));
  };

  return (
    <div>
      <table>
        <thead>
          <tr>
            <th>ID</th>
            <th>First Name</th>
            <th>Last Name</th>
            <th>Age</th>
          </tr>
        </thead>
        <tbody>
          {data.map(row => (
            <tr key={row[0]}>
              <td>{row[0]}</td>
              <td>{row[1]}</td>
              <td>{row[2]}</td>
              <td>{row[3]}</td>
            </tr>
          ))}
        </tbody>
      </table>
      <button onClick={() => updateData(2, 2, "Johnson")}>Update Data</button>
    </div>
  );
}

export default App;

In this example, we have an array of three rows with four columns each. We also have a updateData() function that takes three arguments: id of the row to update, column number to update, and value to update.

When the button is clicked, we call the updateData() function with the values 2 for the id, 2 for the column, and "Johnson" for the value.

The updateData() function then uses the map() function to iterate through the data array and update the corresponding column with the new value. Finally, the state variable data is updated with the new array.