Exploring ways to iterate through an array of objects to extract specific values

Question

Exploring ways to iterate through an array of objects to extract specific values

Kindly read this information thoroughly before marking it as a duplicate. I currently possess an array of objects as shown below.

const filterParams = [
      { 'waterfront_type[]': 'Cove' },
      { 'area[]': 'Applehead Island' },
      { 'waterfront_type[]': 'Channel' },
      { 'waterfront_type[]': 'Open Water' },
      { baths: '0 - 14' },
      { price: '0.00 - 9,876,100.00' }
    ];

My objective is to iterate over this array and incorporate it into form data. I am attempting to achieve this with the following approach.

filterParams.map(param => {
      return formData.append(param.key, param.value);
    });

Expected Outcome: The parameter key is 'waterfront_type[]' and the value is 'Cove'. Therefore, internally it should be

formData.append('waterfront_type[]', 'Cove');

Current Outcome: Both key and value are returning as undefined.

formData.append(undefined, undefined);

javascript arrays

Answer 1

Answer №1

To retrieve the key and value from an object, you can utilize Object.entries() along with array destructuring.

Important: The default = [] takes care of empty object scenarios.

filterParams.map(param => {
  const [[key, value] = []] = Object.entries(param);
  return formData.append(key, value);
});

If your intention is simply to call formData(key, value) without concerning yourself with the returned values, consider using Array.forEach() in place of Array.map():

filterParams.forEach(param => {
  const [[key, value] = []] = Object.entries(param);
  formData.append(key, value);
});

Answer 2

To retrieve the key and value from an object, you can utilize Object.entries() along with array destructuring.

Important: The default = [] takes care of empty object scenarios.

filterParams.map(param => {
  const [[key, value] = []] = Object.entries(param);
  return formData.append(key, value);
});

If your intention is simply to call formData(key, value) without concerning yourself with the returned values, consider using Array.forEach() in place of Array.map():

filterParams.forEach(param => {
  const [[key, value] = []] = Object.entries(param);
  formData.append(key, value);
});

Answer 3

Answer №2

param is a JavaScript object passed to the .map function. You cannot access its keys using the syntax object.key. Instead, try the following approach:

filterParams.map(param => {
   var keys = Object.keys(param);
   return formData.append(keys[0], param[keys[0]]);
});

In this code snippet, we are retrieving all the keys of the param object and extracting the first key (assuming that each object in your array has only one key).

Answer 4

param is a JavaScript object passed to the .map function. You cannot access its keys using the syntax object.key. Instead, try the following approach:

filterParams.map(param => {
   var keys = Object.keys(param);
   return formData.append(keys[0], param[keys[0]]);
});

In this code snippet, we are retrieving all the keys of the param object and extracting the first key (assuming that each object in your array has only one key).

Answer 5

Answer №3

If you're looking to convert all dictionary entrySet into a FormData object, you can use the following code:

filterParams.forEach(param => {
    Object.keys(param).forEach(function(key) {
         let value = param[key];
         formData.append(key, value);
    });      
});

After running the code, the output will be:

["waterfront_type%5B%5D=Cove",
 "area%5B%5D=Applehead%20Island",
 "waterfront_type%5B%5D=Channel",
 "waterfront_type%5B%5D=Open%20Water",
 "baths=0%20-%2014",
 "price=0.00%20-%209%2C876%2C100.00"]

Answer 6

If you're looking to convert all dictionary entrySet into a FormData object, you can use the following code:

filterParams.forEach(param => {
    Object.keys(param).forEach(function(key) {
         let value = param[key];
         formData.append(key, value);
    });      
});

After running the code, the output will be:

["waterfront_type%5B%5D=Cove",
 "area%5B%5D=Applehead%20Island",
 "waterfront_type%5B%5D=Channel",
 "waterfront_type%5B%5D=Open%20Water",
 "baths=0%20-%2014",
 "price=0.00%20-%209%2C876%2C100.00"]

Answer 7

Answer №4

One option is to implement JavaScript filters

 filterParameters = filterParameters.filter(function(item){
   Object.keys(item).forEach(function(property, val){
     return formData.append(property, val);
   })
 })

Answer 8

One option is to implement JavaScript filters

 filterParameters = filterParameters.filter(function(item){
   Object.keys(item).forEach(function(property, val){
     return formData.append(property, val);
   })
 })

Exploring ways to iterate through an array of objects to extract specific values

Answer №1

Answer №2

Answer №3

Answer №4

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