What is the reason that the keyword 'in' does not function for verifying the presence of a particular word within an array in JavaScript?

Currently, I am focused on string manipulation for a chatbot. My main objective is to identify a specific word within a returned string message. Here is an example of my approach:

let msg = 'how are you?'                     //An illustration of a message
let words = msg.split(' ')                   //Splitting the words
if ('are' in words) {}                       //Encountering an issue here

I understand that the in operator is typically used to check for the presence of a number within an array, but it seems to be ineffective for string evaluation. Is there an alternative method to use when dealing with strings? While I could use a loop and an if (words[i] === 'are') {} for checking, I prefer to explore alternative solutions if available.

Answer №2

If you want to check if a string contains a specific word, you can use the words.includes("are") method. Feel free to test it out in this live demo:

let msg = 'how are you?'                     //Example message
let words = msg.split(' ')                   //Split the message into words
console.log(words);
if (words.includes("are")) {
   console.log('The word "are" exists in the message');
} else {
   console.log('The word "are" does not exist in the message');
}

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