如何从指定JSON源提取并过滤键生成数组型输出？

If you need to transform your input JSON into the desired array format—including filtering entries where the key starts with yomama—here's a straightforward approach using JavaScript (one of the most common languages for JSON manipulation):

Step-by-Step Explanation #

The core tasks are:

• Iterate over the keys in the pages object
• Filter out entries that don't start with yomama
• Reshape each remaining entry to include the key as a url property alongside data and order

JavaScript Implementation #

const input = {
  "pages":{
    "yomama/first key": {
      "data": {
        "fieldset": "lesson-video-overview",
        "title": "5th Grade Math - Interpreting Fractions",
      },
      "order": 4
    },
    "yomama/second key": {
      "data": {
        "fieldset": "lesson-video-clip-single",
        "title": "Post-Lesson Debrief Part 5",
      },
      "order": 14
    },
    "yopapa/Third key": {
      "data": {
        "fieldset": "lesson-video-clip-single",
        "title": "Lesson Part 2B",
      },
      "order": 6
    }
  }
};

// Transform and filter entries
const filteredArray = Object.entries(input.pages)
  // Keep only keys starting with "yomama"
  .filter(([key]) => key.startsWith('yomama'))
  // Reshape each entry to the desired structure
  .map(([url, { data, order }]) => ({ url, data, order }));

console.log(filteredArray);

Output #

[
  {
    "url": "yomama/first key",
    "data": {
      "fieldset": "lesson-video-overview",
      "title": "5th Grade Math - Interpreting Fractions"
    },
    "order": 4
  },
  {
    "url": "yomama/second key",
    "data": {
      "fieldset": "lesson-video-clip-single",
      "title": "Post-Lesson Debrief Part 5"
    },
    "order": 14
  }
]

Key Details #

• Filtering: The filter method checks if each key starts with yomama. If you want to include all entries (including yopapa), just remove this line.
• Destructuring: We use array destructuring to get the key (renamed to url) and object destructuring to extract data and order from each entry.
• Case Sensitivity: If you need case-insensitive matching (e.g., Yomama/... should also be included), modify the filter to key.toLowerCase().startsWith('yomama').

Python Alternative #

If you prefer Python, here's an equivalent implementation:

import json

# Load the input JSON
input_data = json.loads('''
{
  "pages":{
    "yomama/first key": {
      "data": {
        "fieldset": "lesson-video-overview",
        "title": "5th Grade Math - Interpreting Fractions"
      },
      "order": 4
    },
    "yomama/second key": {
      "data": {
        "fieldset": "lesson-video-clip-single",
        "title": "Post-Lesson Debrief Part 5"
      },
      "order": 14
    },
    "yopapa/Third key": {
      "data": {
        "fieldset": "lesson-video-clip-single",
        "title": "Lesson Part 2B"
      },
      "order": 6
    }
  }
}
''')

result = []
for url, entry in input_data['pages'].items():
    # Filter entries starting with "yomama"
    if url.startswith('yomama'):
        result.append({
            'url': url,
            'data': entry['data'],
            'order': entry['order']
        })

# Print the formatted result
print(json.dumps(result, indent=2))

This will produce the same filtered array as the JavaScript version.

内容的提问来源于stack exchange，提问作者Selwyn Polit