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how to replace null values from database with empty string in chain for functions – SEO

I’m using lodash and have this code right now 

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

Some of the values can be returned as null from the database. I would like to replace null values with an empty string -> ” but I’m not sure how to chain another function to above chain.

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2

Answers


  1. 0

    You can use || Operator

    _((responseData && responseData.data) || {})
     .pick(['title', 'layout', 'slug', 'author', 'seo', 'css', 'js'])
     .mapKeys((value, key) => _.camelCase(key))
     .value()
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  2. 0

    Use _.mapValues() to iterate the values, and check with _.isNull() if the value is null.

    Note: if you want to handle undefined values as well, replace _.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>
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