如何使用JSONata将字符串数组转换为带行号属性的对象数组？

Got it, I know exactly how to fix this for you! The key here is using JSONata's built-in index tracking when iterating over arrays—you don't have to hardcode line numbers, even if the array length changes.

The Correct Expression #

Instead of your current approach, use either of these two methods to dynamically grab the element's index and set the line value correctly:

Method 1: Using Array Iteration with $index

You can directly iterate over the Street array and access the current element's index with $index (note: it starts at 0, so we add 1 to get the 1-based line number):

Street @ $index.{
  "attributes": {"line": $index + 1},
  "text": $
}

Method 2: Using $map() Function (More Explicit)

If you prefer a more functional style, the $map() function lets you explicitly pass both the value and index of each element:

$map(Street, function($value, $idx) {
  {
    "attributes": {"line": $idx + 1},
    "text": $value
  }
})

How It Works #

• Both methods will loop through every element in your Street array, no matter how long it gets.
• $index (in method 1) or $idx (in method 2) gives you the zero-based position of the current element. Adding 1 converts it to the 1-based line number you need.
• The output will automatically match your desired format: for each string in the input array, you'll get an object with the correct line number and the original text.

Example Test #

If you input:

{ "Street": ["10 First Avenue","Third Floor"] }

Either expression will output:

[
  {
    "attributes": {"line": 1},
    "text": "10 First Avenue"
  },
  {
    "attributes": {"line": 2},
    "text": "Third Floor"
  }
]

And if you add more elements to the Street array later, like ["10 First Avenue","Third Floor","Apt 4B"], it will automatically generate a line: 3 entry for the new element—no changes to the expression needed!

内容的提问来源于stack exchange，提问作者user2554551