The code signal's challenge to find the common character count is a fun

During my iteration through both arrays, I am successfully passing most of the tests. However, there is one test that presents a challenge as it continues to nest the loop against the first loop even after the matched element has been removed.

Input: s1: "abca" s2: "xyzbac"

This is the code snippet I have been working with:

function commonCharacterCount(s1, s2) {
    const arrayOne = s1.split("")
    const arrayTwo = s2.split("")
    var matches = [];

    for (let i = 0; i < arrayOne.length; i++) {
        for (let j = 0; j < arrayTwo.length; j++) {
            console.log(arrayTwo[j],arrayOne[i], matches)
           if (arrayOne[i] === arrayTwo[j]) {
               matches.push(arrayOne[i])
               arrayOne.splice(arrayOne[i], 1)
        
           }
        }
    }
    return matches.length
}

Upon inspecting the console log for test 3, which happens to be failing, I noticed an issue where it skips over the second item "b".

Answer №1

When you slice arrayOne, an item is removed and this causes a skipped item because the variable i increments by 1 while arrayOne loses an element. This results in the following:

arrayOne = ["a","b","c","d"]  
i = 0  
arrayOne[i] results in "a"

Upon finding a match in arrayTwo, arrayOne is sliced at the index i of the matching element, resulting in:

arrayOne = ["b","c","d"]  
// Despite the slicing, i is still incremented by one, making it 
i = 1    
// Therefore, arrayOne[i] now becomes 
arrayOne[i] results in "c"

My explanation may not be perfect, but I have two solutions: One does not splice, while the other splices with a decrement by one.

Option 1:

function commonCharacterCount(s1, s2) {
    const arrayOne = s1.split("")
    const arrayTwo = s2.split("")
    var matches = [];

    for (let i = 0; i < arrayOne.length; i++) {
        for (let j = 0; j < arrayTwo.length; j++) {
            console.log(arrayTwo[j],arrayOne[i], matches)
           if (arrayOne[i] === arrayTwo[j]) {
               matches.push(arrayOne[i])        
           }
        }
    }
    return matches.length
}

Option 2:

function commonCharacterCount(s1, s2) {
    const arrayOne = s1.split("")
    const arrayTwo = s2.split("")
    var matches = [];

    for (let i = 0; i < arrayOne.length; i++) {
        for (let j = 0; j < arrayTwo.length; j++) {
            console.log(arrayTwo[j],arrayOne[i], matches)
           if (arrayOne[i] === arrayTwo[j]) {
               matches.push(arrayOne[i])
               arrayOne.splice(arrayOne[i], 1)
               i--
           }
        }
    }
    return matches.length
}

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