What are some ways to implement the 'charCodeAt' method within a for loop effectively?

Currently, I am working on developing a hangman game in JavaScript to enhance my coding skills. One task that I am facing is extracting the keyCode of a character at a particular position within an array. To achieve this, I have been using the 'charCodeAt' method. While this method works flawlessly for obtaining the keyCode of the character at the initial position (position [0]), it fails to update accordingly as it iterates through the array. Subsequently, instead of returning the correct keyCode for subsequent characters, it returns 'NaN' when accessed beyond the first position.

To debug this issue, I implemented 'console.log()' statements to track the values of the characters being displayed and verify that the loop is functioning correctly in terms of index progression. Despite confirming these aspects, the variable responsible for storing the keyCode of the current character fails to capture this information after the second position (position [1]) in the array. Although I feel that there might be redundancy within the code segment causing this problem, I have yet to devise an alternative solution. Just to clarify, both variables referenced are declared globally within the scope.

for(let i=0; i<theArray.length; i++){
   indexElementValue = theArray[i];
   keyCodeAt = indexElementValue.charCodeAt(i);
   inputElement.addEventListener('keydown', validation);
}

const validation = () => {
   let typing = event.which || event.keyCode;
   if((typing == keyCodeAt) || (typing == 20) || (typing == 32) || (typing == 8) || (typing == 9) || (typing == 13) || (typing == 16)){
   }else{
      console.warn('WRONG');
   }
}

I am hopeful that by resolving the issue with the 'keyCodeAt' variable, it will successfully retrieve and store the correct keyCodes for all positions within the array, rather than only functioning correctly at the first position followed by producing 'NaN' for subsequent positions.

Answer №1

If you are working with the theArray, consider using either of the following approaches:

keyCodeAt = theArray.charCodeAt(i);

or (though a bit excessive):

indexElementValue = theArray[i];
keyCodeAt = indexElementValue.charCodeAt(0);

However, if you use:

indexElementValue = theArray[i];
keyCodeAt = indexElementValue.charCodeAt(i);

...you are accessing characters beyond the single character stored in indexElementValue, which is only at index 0.

Note

Running this snippet inside a loop doesn't serve any purpose:

inputElement.addEventListener('keydown', validation);

This should be executed just once. This statement simply assigns the keydown handler function and does not actually trigger the validation function execution repeatedly.

Additionally, since the loop doesn't utilize the keyCodeAt variable, it seems unnecessary to retrieve it.

It would be more efficient to eliminate the loop altogether and opt for using the includes method available for Arrays within the keydown event handler:

inputElement.addEventListener('keydown', validation);
const validation = (e) => {
   e = e || event;
   let typing = e.which || e.keyCode;
   if(!theArray.includes(typing) && ![20,32,8,9,13,16].includes(typing)) {
      console.warn('WRONG');
   }
}

Moreover, ensure that you utilize the event argument as per the standard practice. The global event object may not be defined across all platforms.

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