Add MappedTable

snippets/MappedTable.md

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+### MappedTable
+
+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.
+
+```jsx
+function 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>
+  );
+}
+```
+
+```jsx
+const people = [
+  { name: 'John', surname: 'Smith', age: 42 },
+  { name: 'Adam', surname: 'Smith', gender: 'male' }
+];
+const propertyNames = ['name', 'surname', 'age'];
+ReactDOM.render(
+  <MappedTable data={people} propertyNames={propertyNames} />,
+  document.getElementById('root')
+);
+```
+
+<!-- tags: array,object,functional -->
+
+<!-- expertise: 1 -->