I'm encountering a problem with Internet Explorer freezing due to the following code. This code is part of a project that focuses on handling student grades:
var array1 = StudentGradeAreadHugeList();
var nextArrayItem = function() {
var grade = array1.pop();
if (grade) {
nextArrayItem();
}
};
Your assistance in resolving this issue would be greatly appreciated.
If you provide more details about the specific application you are working on, it could be helpful. However, it seems like you may be encountering a stack overflow issue, possibly due to using a large list. To address this, consider modifying the "nextArrayItem" function:
window.setTimeout(nextArrayItem, 0)The freezing problem is likely stemming from handling large amounts of data. By utilizing the Event Loop for recursion instead of relying solely on the Call Stack, you can mitigate this issue.
The issue here is most likely a result of continuous recursion. It's important to handle return values correctly in Internet Explorer.
var list1 = StudentGradeLargeList();
var findNextItem = function() {
var gradeValue = list1.pop();
if ( gradeValue !== null && typeof(gradeValue) !== "undefined" ) {
findNextItem();
}
};
When using pop() on an empty array, it will not give back a boolean value of false, but rather a generic "undefined".
Here are a couple of issues that need to be addressed:
Regarding the first problem:
If you have a large list, it's possible to surpass the call stack limit when making recursive calls for each element. While using setTimeout could be a workaround, it seems like a makeshift solution. The root issue lies in handling the array recursively instead of iteratively within your function. I suggest rewriting your function with a for loop.
For the second problem:
Consider an array like [100, 90, 80]. On the third invocation of nextArrayItem(), you end up popping off the last element (in this case 100). Since 100 is truthy, the if statement passes mistakenly, leading your function to recurse despite an empty array. The program should exit the call stack at this point.
I tested your code scenario in Chrome and noticed an extra recursion resulting in a pop operation on an empty array, yielding undefined.
To resolve this, modify the if condition to verify the last element post-pop:
Updated code snippet:
var nextArrayItem = function() {
var grade = array1.pop();
if (array1[array1.length-1]) {
nextArrayItem();
}
};
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