Filtering array and then map array in array

Question

Pretty sure that I am missing something simple but this code has me banging my head.

I have an array in a local json file as

{
  "type": [
    {
      "name": "Accommodation",
      "icon": "🏨",
      "subcategory": [
        "Hotels",
        "Motels",
        "Bed & Breakfasts"
      ]
    },
    {
      "name": "Guided Tours",
      "icon": "🚌",
      "subcategory": [
        "Audio & Self Guided",
        "Cruises, Sailing & Water",
        "Food, Wine & Nightlife"
      ]
    }
  ]
}

and importing into a React component as

import { type } from './assets/json/company-type.json';

then I am using filter to the name of companyType (which is based on a select value of either Accommodation or Guided Tours. After I map the returned items before map the subcategory

<ul>
  {type
    .filter(item => {
      return item.name === companyType;
    })
    .map(item => {
      item.subcategory.map(subcategory => {
        <li key={subcategory}>
          <label id={subcategory} htmlFor={subcategory}>
            <input
              type="radio"
              name={subcategory}
              value={subcategory}
            />
            <span />
            {subcategory}
          </label>
        </li>;
      });
    })}
</ul>

However, nothing is returned. Yet if I log subcategory I get each returned in the console. What am I missing?

Sameer · Accepted Answer · 2018-10-13 07:50:33Z

1

This is because you are not returning from .map() methods. Use this modified code and it will work as expected

<ul>
    {type
      .filter(item => {
        return item.name === "Accommodation";
      })
      .map(item => {
        return item.subcategory.map(subcategory => {
          return (
            <li key={subcategory}>
              <label id={subcategory} htmlFor={subcategory}>
                <input
                  type="radio"
                  name={subcategory}
                  value={subcategory}
                />
                <span />
                {subcategory}
              </label>
            </li>
          );
        });
      })}
 </ul>

codeSandbox link: https://codesandbox.io/s/4881483j7x

answered Oct 13, 2018 at 7:50

Sameer

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