The most efficient method to obtain the accurate value

Question

The most efficient method to obtain the accurate value

I'm currently facing an issue with extracting a value from a JSON object. Each JSON object in my array has a name (attribute), a similarity (ignore this for now), and an array named "values" with keys and corresponding values.

For each case, I have a value from this array, as shown in the example below. My goal is to retrieve the value from "Values" using the key specified in my case.

Currently, I am using two nested loops, one to find the correct attribute and another to find the right key. Is there a more efficient way to achieve this? If necessary, I can restructure this JSON schema.

Here is my array:

[
  {
    "attribute": "date",
    "similarity": "Sim",
    "values": [
      {"key": "Unknown", "value": "?"},
      {"key": "April", "value": "0"},
      {"key": "May", "value": "1"},
      {"key": "June", "value": "2"},
      {"key": "July", "value": "3"},
      {"key": "August", "value": "4"},
      {"key": "September", "value": "5"},
      {"key": "October", "value": "6"}
    ]
  },
  ...
]

A sample case:

{
    "case": 1,
    "disease": "diaporthe-stem-canker",
    "areaDamaged": "low-areas",
    "cankerLesion": "Brown",
    ...
  }

In the case where "areaDamaged" is set to "low-areas," I want to extract the corresponding value associated with "low-areas." Does anyone know a better approach?

javascript arrays json

Answer 1

Answer №1

When considering what is "better," I assume you are referring to efficiency.

In that case, if arrays are present everywhere in your code, there may not be a more "efficient" option available.

However, if your arrays contain reference data that will be accessed repeatedly, one approach could be to convert the arrays into maps for improved performance. Here's an example:

var refDataMap = {};

var refDataItem, refDataValue;

for (var i = 0; i < refData.length; i++) {
    refDataItem = refData[i];
    refDataMap[refDataItem.attribute] = refDataItem;
    refDataItem.valuesMap = {};
    for (var j = 0; j < refDataItem.values.length; j++) {
        refDataValue = refDataItem.values[j];
        refDataItem.valuesMap[refDataValue.key] = refDataValue.value;
    }
}

var result = refDataMap["seed"].valuesMap["Abnorm"]; // Returns value 1

Performance tests have shown that accessing a map like this is approximately 25% faster than iterating over arrays ().

However, if the map initialization sequence is included in the test, then arrays are twice as fast when measured for a single access ().

Based on observations, it seems that you would need to access this data around 50 times for the overhead of map initialization to become beneficial ().

Answer 2

When considering what is "better," I assume you are referring to efficiency.

In that case, if arrays are present everywhere in your code, there may not be a more "efficient" option available.

However, if your arrays contain reference data that will be accessed repeatedly, one approach could be to convert the arrays into maps for improved performance. Here's an example:

var refDataMap = {};

var refDataItem, refDataValue;

for (var i = 0; i < refData.length; i++) {
    refDataItem = refData[i];
    refDataMap[refDataItem.attribute] = refDataItem;
    refDataItem.valuesMap = {};
    for (var j = 0; j < refDataItem.values.length; j++) {
        refDataValue = refDataItem.values[j];
        refDataItem.valuesMap[refDataValue.key] = refDataValue.value;
    }
}

var result = refDataMap["seed"].valuesMap["Abnorm"]; // Returns value 1

Performance tests have shown that accessing a map like this is approximately 25% faster than iterating over arrays ().

However, if the map initialization sequence is included in the test, then arrays are twice as fast when measured for a single access ().

Based on observations, it seems that you would need to access this data around 50 times for the overhead of map initialization to become beneficial ().

Answer 3

Answer №2

Instead of including the properties "valor" and "chave" within the json file, you have the option to directly use key/value pairs in the json structure.

For example:

var attributes = {    
    "areaDamaged" : {
        "similarity": "Same",
        "values": {
             "Unknown" : "?",
             "scattered" : "0",
             "low-areas" : "1",
             "upper-areas" : "2",
             "whole-field" : "3"
         }
    },
 ...

As a result, retrieving the value becomes simpler:

var value = attributes["areaDamaged"].values["low-areas"];

Answer 4

Instead of including the properties "valor" and "chave" within the json file, you have the option to directly use key/value pairs in the json structure.

For example:

var attributes = {    
    "areaDamaged" : {
        "similarity": "Same",
        "values": {
             "Unknown" : "?",
             "scattered" : "0",
             "low-areas" : "1",
             "upper-areas" : "2",
             "whole-field" : "3"
         }
    },
 ...

As a result, retrieving the value becomes simpler:

var value = attributes["areaDamaged"].values["low-areas"];

The most efficient method to obtain the accurate value

Answer №1

Answer №2

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