react-native-web/performance/modules/NestedTree.js

import React, { Component, PropTypes } from 'react';

class DeepTree extends Component {
  static propTypes = {
    breadth: PropTypes.number.isRequired,
    components: PropTypes.object,
    depth: PropTypes.number.isRequired,
    id: PropTypes.number.isRequired,
    wrap: PropTypes.number.isRequired
  };

  render() {
    const { breadth, components, depth, id, wrap } = this.props;
    const { Box } = components;

    let result = (
      <Box color={id % 3} components={components} layout={depth % 2 === 0 ? 'column' : 'row'} outer>
        {depth === 0 && <Box color={id % 3 + 3} components={components} fixed />}
        {depth !== 0 &&
          Array.from({ length: breadth })
            .map((el, i) => (
              <DeepTree
                breadth={breadth}
                components={components}
                depth={depth - 1}
                id={i}
                key={i}
                wrap={wrap}
              />
            ))}
      </Box>
    );
    for (let i = 0; i < wrap; i++) {
      result = <Box components={components}>{result}</Box>;
    }
    return result;
  }
}

module.exports = DeepTree;