11ty filter to filter a collection (array) by key:value pair - used to filter on custom taxonomies other than tags (source: https://paulrobertlloyd.com/)

11ty_contains.js

/**
 * Select objects in array whose key includes a value
 *
 * @param {Array} arr Array to test
 * @param {String} key Key to inspect
 * @param {String} value Value key needs to include
 * @return {String} Filtered array
 *
 */
module.exports = function (arr, key, value) {
  return arr.filter(item => {
    const keys = key.split('.');
    const reduce = keys.reduce((object, key) => {
      return object[key];
    }, item);
    const str = String(reduce);

    return (str.includes(value) ? item : false);
  });
};

Is there an example repo of how to incorporate this into an 11ty project? I'm trying to create multiple custom taxonomies (categories, mediums, etc.) and have spent many hours trying to figure out how to incorporate this with no luck. Thanks in advance for any assistance!

@danfascia, thanks for this.

@shanerobinson if you've included it your config then you can use it like this {% for item in list | contains('featured', true) %>