将单个类型为字符串的元素的数组“神奇地”转换为字符串

Question

Not sure why this is happening. At this point in my code these array may have a single element.

actualAnswer = actualAnswer.split(" ");
playerAnswer = playerAnswer.split(" ");

I then pass them through this function.

     function checkForPlural(playerAnswer, actualAnswer){

var answerObject = {playerAnswer: playerAnswer,
                    actualAnswer: actualAnswer};

for (var answerWord in actualAnswer){
    if (actualAnswer[answerWord].slice(-1) == "S")
    {
            answerObject.actualAnswer[answerWord] = actualAnswer[answerWord].substring(0, actualAnswer[answerWord].length - 1);
    }
}
for (var answerWord in playerAnswer){
    if (playerAnswer[answerWord].slice(-1) == "S")
    {
            answerObject.playerAnswer[answerWord] = playerAnswer[answerWord].substring(0, playerAnswer[answerWord].length - 1);
    }
}
}

When I return the object IF the array's passed in only had a single element javascript decides to interpret them as a string so if I were to use answerObject.actualAnswer.length it'll give me the length of the string, rather than just 1.

Here is the plunker, unfortunately/fortunately it seems to work as intended on there so i'm confused: https://plnkr.co/edit/nIqq3VdjjMa2GDWyqkxx

EDIT: The problem was at an earlier junction in my code, sorry!

Answer 1

You can use Array.prototype.map() to return a new array, String.prototype.replace() to, if exists, replace the ending "S" character in a string, return an object having properties set to the function parameter identifiers

 const regexp = /S$/; const re = ""; function parseAnswer(arr, regexp_, re_) { return arr.map(function(prop) {return prop.replace(regexp_, re_)}) } function checkForPlural(playerAnswer, actualAnswer) { return { playerAnswer: parseAnswer(playerAnswer, regexp, re), actualAnswer: parseAnswer(actualAnswer, regexp, re) } } console.log(checkForPlural("abc defS ghi".split(" "), "12S 456 78S".split(" "))) 

Answer 2

The code in question is working correctly, the "magic" conversion was because of an error in another function that was overwriting the array with a string. My bad.