Learn the process of converting Null values to empty strings within a chain of functions when manipulating a database

Currently, I am utilizing the lodash library and have the following code in place:

data: _(responseData.data)
     .pick(['title', 'layout', 'slug', 'author', 'seo', 'css', 'js'])
     .mapKeys((value, key) => _.camelCase(key))
     .value()

It is possible for some of the values to be null when retrieved from the database. My goal is to replace these null values with an empty string -> '' but I am uncertain how to add another function to the existing chain above.

Answer №1

Utilize the _.mapValues() method to iterate through the values, and use _.isNull() to check if the value is null.

Please note: if you need to handle undefined values as well, swap out _.isNull() with _.isNil().

const responseData = {
  data: {
    'title': 'title',
    'layout': null,
    'slug': null,
    'author': 'author',
    'seo': 'seo',
    'css': 'css',
    'js': 'js'
  }
}

const data = _(responseData.data)
  .pick(['title', 'layout', 'slug', 'author', 'seo', 'css', 'js'])
  .mapKeys((value, key) => _.camelCase(key))
  .mapValues(value => _.isNull(value) ? '' : value)
  .value()

console.log(data)
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.js"></script>

Answer №2

To utilize the || operator:

_((responseData && responseData.data) || {})
     .pick(['title', 'layout', 'slug', 'author', 'seo', 'css', 'js'])
     .mapKeys((value, key) => _.camelCase(key))
     .value()

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