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Find the Symmetric Difference

kouqhar answered on October 10, 2023 Popularity 2/10 Helpfulness 1/10

answer Find the Symmetric Difference

Find the Symmetric Difference

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/*
	The mathematical term symmetric difference (△ or ⊕) of two sets is the set of 
    elements which are in either of the two sets but not in both. For example, 
    for sets A = {1, 2, 3} and B = {2, 3, 4}, A △ B = {1, 4}.

	Symmetric difference is a binary operation, which means it operates on only 
    two elements. So to evaluate an expression involving symmetric differences 
    among three elements (A △ B △ C), you must complete one operation at a time. 
    Thus, for sets A and B above, and C = {2, 3}, 
    A △ B △ C = (A △ B) △ C = {1, 4} △ {2, 3} = {1, 2, 3, 4}.

	Create a function that takes two or more arrays and returns an array of their 
    symmetric difference. The returned array must contain only unique values 
    (no duplicates).
*/

  function sym(...args) {
    const [difA, difB] = args.splice(0, 2)
    const newSetA = [...new Set(difA)]
    const newSetB = [...new Set(difB)]
    let [finalArr, partialObj] = [[], {}]

    newSetA.concat(newSetB).forEach(elem => 
      partialObj[elem] ? partialObj[elem]++ : partialObj[elem] = 1)

    args.forEach(elem => {
      const elemSet = [... new Set(elem)]
      elemSet.forEach(item => 
        partialObj[item] ? partialObj[item]-- : partialObj[item] = 1)
    })

    for(let [keys, values] of Object.entries(partialObj))
      values === 1 ? finalArr.push(Number(keys)) : null

    return finalArr
  }

sym([1, 1, 2, 5], [2, 2, 3, 5], [3, 4, 5, 5]); // [1, 4, 5]
sym([1, 2, 3], [5, 2, 1, 4, 5]); // [3, 4, 5]
sym([3, 3, 3, 2, 5], [2, 1, 5, 7], [3, 4, 6, 6], [1, 2, 3], [5, 3, 9, 8], [1]) 
// [1, 2, 4, 5, 6, 7, 8, 9]

// With love @kouqhar

Popularity 2/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: find javascript symmetric-difference

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Contributed on Oct 10 2023

kouqhar

0 Answers Avg Quality 2/10

Find the Symmetric Difference

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