30-seconds-of-code/snippets/MappedTable.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Object table view	components,array,object	waves-from-above-2	2018-11-29T11:50:10+02:00	2020-09-06T14:20:45+03:00

Renders a table with rows dynamically created from an array of objects and a list of property names.

• Use Object.keys(), Array.prototype.filter(), Array.prototype.includes() and Array.prototype.reduce() to produce a filteredData array, containing all objects with the keys specified in propertyNames.
• Render a <table> element with a set of columns equal to the amount of values in propertyNames.
• Use Array.prototype.map() to render each value in the propertyNames array as a <th> element.
• Use Array.prototype.map() to render each object in the filteredData array as a <tr> element, containing a <td> for each key in the object.
• Note: This component does not work with nested objects and will break if there are nested objects inside any of the properties specified in propertyNames.

const MappedTable = ({ data, propertyNames }) => {
  let filteredData = data.map(v =>
    Object.keys(v)
      .filter(k => propertyNames.includes(k))
      .reduce((acc, key) => ((acc[key] = v[key]), acc), {})
  );
  return (
    <table>
      <thead>
        <tr>
          {propertyNames.map(val => (
            <th key={`h_${val}`}>{val}</th>
          ))}
        </tr>
      </thead>
      <tbody>
        {filteredData.map((val, i) => (
          <tr key={`i_${i}`}>
            {propertyNames.map(p => (
              <td key={`i_${i}_${p}`}>{val[p]}</td>
            ))}
          </tr>
        ))}
      </tbody>
    </table>
  );
};

const people = [
  { name: 'John', surname: 'Smith', age: 42 },
  { name: 'Adam', surname: 'Smith', gender: 'male' }
];
const propertyNames = ['name', 'surname', 'age'];
ReactDOM.createRoot(document.getElementById('root')).render(
  <MappedTable data={people} propertyNames={propertyNames} />
);