有没有办法比较两个 arrays 中的字符串，看看其中一个是否存在于另一个中

Question

I have two arrays.

First one: const triggerWord = ["what", "how", "where", "who", "can"];

Second one: const myArray = query.split(" "); - it is created after splitting the user input in this case called query.

One is a fixed number of strings, that will not change as they are the trigger words. The other array is an input string that has been split into an array, separated by a space.

I am trying to build some sort of control flow that if any of the triggerWords are present within the myArray then it should call a specific function call the questionFunction(). However the else is that is should call the statement function. Here are the functions I have attempted:

#1: Switch Case:

switch (lowercaseMyArray.includes()) {
    case triggerWord[0].toString():
        questionFunction(lowercaseMyArray);
        break;
    case triggerWord[1].toString():
        questionFunction(lowercaseMyArray);
        break;
    case triggerWord[2].toString():
        questionFunction(lowercaseMyArray);
        break;
    case triggerWord[3].toString():
        questionFunction(lowercaseMyArray);
        break;
    default:
       statementFunction(lowercaseMyArray);

#2: If statement

if (lowercaseMyArray.includes(triggerWord[0] || triggerWord[1] || triggerWord[2] || triggerWord[3], 2)) {
    //alert("This is a question");
    questionFunction(lowercaseMyArray);
    //passe onto questionFunction
} else {
    statementFunction(lowercaseMyArray);
    //alert(myArray);
}

#3: Bool and If Statment

var lowercaseMyArrayBool = lowercaseMyArray.includes(triggerWord);

    if (lowercaseMyArrayBool === true) {
        questionFunction(lowercaseMyArray);
    } else {
        statementFunction(lowercaseMyArray);
    }

The idea being that if it contains a trigger word then the input must be a question and therefore treated as such. However if it doesn't contain the trigger words then the input is a statement and must be treated as that.

Any help or pointers will be greatly appreciated.

Answer 1

Resolved this with the following code:

const intersection = triggerWord.filter(element => lowercaseMyArray.includes(element)).length;
const intersectionBool = Boolean(intersection);

I just needed to cast the filtered array length as a Boolean, to get an accurate true or false result.