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                    <h1>api/utils/createIdSet.js</h1>
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        <article>
            <pre class="prettyprint source linenums"><code>/**
 * Creates a set of all values for a list of documents and respective fieldnames to look for.
 * @param docs {object[]}
 * @param fieldNames {string|string[]}
 * @param includeNull {boolean} flag to include null values in map
 * @return {Set&lt;any>}
 */
export const createIdSet = (docs, fieldNames, includeNull = false) => {
  const ids = new Set()
  const fields = Array.isArray(fieldNames)
    ? fieldNames
    : [fieldNames]
  docs.forEach(doc => {
    fields.forEach(fieldName => {
      const value = doc[fieldName]
      const isDefined = value !== undefined
      const include = value !== null || includeNull
      if (isDefined &amp;&amp; include) {
        ids.add(value)
      }
    })
  })
  return ids
}
</code></pre>
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