How to get values between two numbers in an array?

Question

["10","13"] is the array, need to find the values between them and flatten the array with the values -> ["10","11","12","13"].

The first array above (["10", "13"]) is in a list of arrays.

const OriginalData = {
   Red:{
      Name:"L",
      List:[
         ["1", "5"],
         ["2", "5"],
         ["7", "9" ],
      ]
   },
   Blue:{
      Name:"BL",
      List:[
         ["1", "5"],
         ["7", "9" ],
         ["10", "13" ],
         ["15", "20"]
      ]
   },
   Black:{
      List:[
         ["Random"],
         "Random2"
      ]
   }
}

Then finally Object must look like,

{
   Level:{
      Name:"L",
      List:[
        1, 2, 3, 4, 5, 7, 8, 9
      ]
   },
   Basement:{
      Name:"BL",
      List:[
        1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20
     ] 
   },
   Custom:{
      List:[
         "Random",
         "Random2"
      ]
   }
}

What It should do: Take the first object, inside List there are set of ranges, the values between those ranges should be found a flatten without duplicates. Finding the values between is only for "Red", and "Blue", In "Black" key only flatten is needed.

I tried,

Code:

  const submitData = () => {
    let obj = originalData;
    let flattenedArray = [].concat.apply([], originalData.Red.List);
    let uniqueArray = flattenedArray.filter(
      (v, i, a) => a.indexOf(v) === i
    );
    obj = {
      ...originalData,
      Red: {
        ...originalData.Red,
        List: uniqueArray,
      },
    };
    console.log(obj);
  };

The above code flattens the array but will not find between the numbers and it only worked for key "Red"

Once you flatten the list, use min and max to get your full range of the array. Then use those conditions to create a new array with a simple loop. I would also split up your code to get that range from another function, this way you can reuse it and pass the list as a parameter. — Wimanicesir
– Wimanicesir, Commented Jun 17, 2022 at 8:48

Wimanicesir · Accepted Answer · 2022-06-17 08:54:13Z

1

A simple example to create a range:

let example = ["10","13"];
let min = Math.min(...example);
let max = Math.max(...example);
let result = [];

for (i = min; i <= max; i++) {
  result.push(i);
}

console.log(min, max, result)

answered Jun 17, 2022 at 8:54

Wimanicesir

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3 Comments

Sai Krishnadas Over a year ago

this works only for a single array. Mine is List of arrays

Wimanicesir Over a year ago

Sorry, as I said in my comments this is just the function to get the range. The rest of your code seems to work. I thought you already had achieved a flattened list. (Like you said in your first sentence)

Sai Krishnadas Over a year ago

Yeah, but the looping through the list isn't working properly. Would you mind posting the entire code ?

Rohìt Jíndal · Accepted Answer · 2022-06-17 10:45:54Z

You can easily achieve it with a simple logic and will work for random numbers as well.

Try this (Descriptive comments of implementation has been added in the below code snippet) :

const OriginalData = {
   Red:{
      Name:"L",
      List:[
         ["1", "5"],
         ["2", "5"],
         ["7", "9" ],
      ]
   },
   Blue:{
      Name:"BL",
      List:[
         ["1", "5"],
         ["7", "9" ],
         ["10", "13" ],
         ["15", "20"]
      ]
   }
};

Object.keys(OriginalData).forEach(key => {
  // Flatten the original array list. 
    OriginalData[key].List = OriginalData[key].List.flat()
  // Find min and max numbers from the array.
  const min = Math.min(...OriginalData[key].List);
  const max = Math.max(...OriginalData[key].List);
  // empty existing list array.
  OriginalData[key].List = [];
  // Now using for loop assign the values to the list array based on min and max value.
  for (let i = min; i <= max; i++) {
    OriginalData[key].List.push(i);
  }
});

// Result
console.log(OriginalData);

Johann Schwarze · Accepted Answer · 2022-06-18 15:44:35Z

To create an array of all the numbers in a given range, you can create a new array with the required size and then map each of it's entries to the entry's index plus the given lower bound.

function fillRange(r) {
    let b = +r[1]
    let a = +r[0]
    if (a > b) {
        let tmp = a
        a = b
        b = tmp
    }
    return Array(b - a + 1).fill(0).map((e, i) => a + i)
}

This function flattens an array and removes all duplicate entries.

function union(arrays) {
    let flattened = [].concat.apply([], arrays)
    return flattened.reduce(
            (total, e) => {
                let i = total.indexOf(e)
                if (i === -1) {
                    total.push(e)
                }
                return total
            }, [])
}

Then this code produces the desired result from a list of ranges:

function unionRanges(ranges) {
    let expanded = ranges.map((e) => fillRange(e))
    return union(expanded).sort((a,b) => (a-b))
}

The final object can be created like this:

function processData(data) {
    let res = {}
    res.Level = {}
    res.Basement = {}
    res.Custom = {}
    
    res.Level.Name = data.Red.Name;
    res.Level.List = unionRanges(data.Red.List)
    
    res.Basement.Name = data.Blue.Name
    res.Basement.List = unionRanges(data.Blue.List)
    
    res.Custom.List = union(data.Black.List)
    
    return res
}

Ele · Accepted Answer · 2022-06-17 08:49:59Z

0

You can flat the array, get the min and max and finally with a loop create the desired array.

const array = [["1","5"],["7","9"],["10","13"],["15","20"]];         
const flatted = array.flat();
const min = Math.min(...flatted);
const max = Math.max(...flatted);

const result = Array.from({length: max + 1 - min}).map(function(_, i) {
    return i + min;
});

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Jun 17, 2022 at 8:49

Ele

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2 Comments

Sai Krishnadas Over a year ago

This just gives min and max of the flattened array. I need the min max of each array, and flatten the values

Ele Over a year ago

@SaiKrishnadas now it's up to you how to use it to solve the problem.

MTamuli · Accepted Answer · 2022-06-18 14:28:05Z

0

Hope the below codes help you.

const OriginalData = {
    Red: {
        Name: "L",
        List: [
            ["1", "5"],
            ["2", "5"],
            ["7", "9"],
        ]
    },
    Blue: {
        Name: "BL",
        List: [
            ["1", "5"],
            ["7", "9"],
            ["10", "13"],
            ["15", "20"]
        ]
    },
    Black: {
        List: [
            ["Random"],
            "Random2"
        ]
    }
};

//Iterating over the object OriginalData
Object.keys(OriginalData).forEach(key => {
    // Flatten the array "List" of each element
    OriginalData[key].List = OriginalData[key].List.flat();

    // Checking if the flatten array contains integers
    if (!isNaN(parseInt(OriginalData[key].List[0]))) {
        // Calculating the min and max of the "List" array
        const min = Math.min(...OriginalData[key].List);
        const max = Math.max(...OriginalData[key].List);

        let tmpArr = [];
        // Generating the array with numbers from min to max
        for (let i = min; i <= max; i++) {
            tmpArr.push(i);
        }
        // Updating the original "List" (containing integers) of each element
        OriginalData[key].List = tmpArr;
    }
});

console.log(OriginalData);

edited Jun 18, 2022 at 14:28

answered Jun 17, 2022 at 13:31

MTamuli

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1 Comment

Ethan Over a year ago

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

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