determining if a condition is vacant or occupied

Question

determining if a condition is vacant or occupied

Seeking assistance in determining if the array is empty or not. What are the conditions for this?

An empty array appears as follows:

[
    {
        "readTime": "2019-09-09T15:20:44.648599Z"
    }
]

A non-empty array looks like this:

[
    {
        "document": {
            "name": "projects/warrenty-MdBQxhFSQF11ZKImqL",
            "fields": {
                "plate": {
                    "stringValue": "AW69176"

                "createDate": {
                    "timestampValue": "2019-08-22T21:08:42.563Z"
                },
                "product": {
                    "stringValue": "Paint"
                },
                "exp_date": {
                    "timestampValue": "2026-08-22T21:08:18Z"
                }
            },
            "createTime": "2019-08-22T21:09:19.972639Z",
            "updateTime": "2019-09-09T11:33:27.134588Z"
        },
        "readTime": "2019-09-09T15:19:49.433613Z"
    },
]

javascript arrays json react-native react-native-flatlist

Answer 1

Answer №1

If you inspect the JSON structure, you will notice that you can simply verify the presence of the 'document' property in each object.

for (let index = 0; index < jsonData.length; index++){
    if (jsonData[index].document){
      // Property exists
    }
    else { 
        // Property doesn't exist
    }
}

Answer 2

If you inspect the JSON structure, you will notice that you can simply verify the presence of the 'document' property in each object.

for (let index = 0; index < jsonData.length; index++){
    if (jsonData[index].document){
      // Property exists
    }
    else { 
        // Property doesn't exist
    }
}

Answer 3

Answer №2

You can iterate over the array using forEach and utilize hasOwnProperty to verify if the object contains a key named document

let info = [{
  "document": {
    "name": "projects/warrenty-MdBQxhFSQF11ZKImqL",
    "fields": {
      "plate": {
        "stringValue": "AW69176",

        "createDate": {
          "timestampValue": "2019-08-22T21:08:42.563Z"
        },
        "product": {
          "stringValue": "Paint"
        },
        "exp_date": {
          "timestampValue": "2026-08-22T21:08:18Z"
        }
      },
      "createTime": "2019-08-22T21:09:19.972639Z",
      "updateTime": "2019-09-09T11:33:27.134588Z"
    },
    "readTime": "2019-09-09T15:19:49.433613Z"
  }
}, {
  "readTime": "2019-09-09T15:19:49.433613Z"
}]

info.forEach((element, i) => {
  if (element.hasOwnProperty('document')) {
    console.log(`The object at index ${i} includes a document key`)
  } else {
    console.log(`The object at index ${i} does not contain a document key`)
  }

})

Answer 4

You can iterate over the array using forEach and utilize hasOwnProperty to verify if the object contains a key named document

let info = [{
  "document": {
    "name": "projects/warrenty-MdBQxhFSQF11ZKImqL",
    "fields": {
      "plate": {
        "stringValue": "AW69176",

        "createDate": {
          "timestampValue": "2019-08-22T21:08:42.563Z"
        },
        "product": {
          "stringValue": "Paint"
        },
        "exp_date": {
          "timestampValue": "2026-08-22T21:08:18Z"
        }
      },
      "createTime": "2019-08-22T21:09:19.972639Z",
      "updateTime": "2019-09-09T11:33:27.134588Z"
    },
    "readTime": "2019-09-09T15:19:49.433613Z"
  }
}, {
  "readTime": "2019-09-09T15:19:49.433613Z"
}]

info.forEach((element, i) => {
  if (element.hasOwnProperty('document')) {
    console.log(`The object at index ${i} includes a document key`)
  } else {
    console.log(`The object at index ${i} does not contain a document key`)
  }

})

Answer 5

Answer №3

What you refer to as the "empty array" is actually not completely empty, as it contains an object within it. However, it seems like what you are trying to determine is whether this array holds an object with a structure similar to that of another array.

To check if your array is indeed "empty," you can examine whether the contained object has a property named "document" or not.

function checkEmptyArray(array){
 var object = array[0];
 return !object.hasOwnProperty('document'); 
}

This function will provide a true outcome when the array is considered "empty," and false if it is not.

Answer 6

What you refer to as the "empty array" is actually not completely empty, as it contains an object within it. However, it seems like what you are trying to determine is whether this array holds an object with a structure similar to that of another array.

To check if your array is indeed "empty," you can examine whether the contained object has a property named "document" or not.

function checkEmptyArray(array){
 var object = array[0];
 return !object.hasOwnProperty('document'); 
}

This function will provide a true outcome when the array is considered "empty," and false if it is not.

determining if a condition is vacant or occupied

Answer №1

Answer №2

Answer №3

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