Retrieve particular information from an array and transfer it to another array

In my JavaScript code, I have a result stored in an object named "availableDates". I am looking to extract the dates that have a value greater than 3 and place them into a new array.

"availableDates": {
  "2020-01-24": 1,
  "2020-01-23": 3,
  "2020-01-22": 2,
  "2020-01-21": 1,
  "2020-01-25": 4,
  "2021-01-07": 1
}

Here's the grouping function I'm using:

const formattedDate = x.reduce((acc,el) => {
  const date = el.split(" ")[0];
  acc[date] = (acc[date] || 0) + 1;
  return acc;
}, {});

Now, I need to populate another array with all the dates that have a value greater than 3. For example:

newarray = [ "2020-01-23", "2020-01-25" ]
javascriptarraysobjectfilterjavascript-objects

Answer №1

Is there a reason why you are not utilizing a simple .filter() method on the keys within the "availableDates" object?

const grouped =  {
  "availableDates": {
      "2020-01-24": 1,
      "2020-01-23": 3,
      "2020-01-22": 2,
      "2020-01-21": 1,
      "2020-01-25": 4,
      "2021-01-07": 1
  }
};

const newArray = Object.keys(grouped.availableDates).filter((key) => grouped.availableDates[key] >= 3);

console.log(newArray);

Answer №2

To filter object keys, you can utilize a for...in loop for iteration:

const data = {
  "2020-01-24": 1,
  "2020-01-23": 3,
  "2020-01-22": 2,
  "2020-01-21": 1,
  "2020-01-25": 4,
  "2021-01-07": 1
};

const filterKeys = (obj, val) => {
  const result = [];

  for(key in obj) {
    if(obj[key] >= val)
      result.push(key);
  };
  
  return result;
};

console.log(filterKeys(data, 3));

Answer №3

Here is a sample code snippet for you to try out. Feel free to copy and paste it into your editor:

var availableDates = new Array()
var availableDates =  {
        "2020-01-24": 1,
        "2020-01-23": 3,
        "2020-01-22": 2,
        "2020-01-21": 1,
        "2020-01-25": 4,
        "2021-01-07": 1
    }
var results = new Array();
 for (date in availableDates){
   if (availableDates[date] >= 3){
      results.push(date)    
  }
 }

 console.log(results)

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