JS: The for loop will keep iterating even if the condition becomes false

Can anyone help me understand why my for loop is continuing even after the conditions are met? Unfortunately I can't share the entire file due to its size, but here is a snippet of the loops:

for (var j = 0; j < depKeyArr.length; j++) {
    var directory = angular.copy(dependencies[depKeyArr[j]]),
        keyArr = angular.copy(Object.keys(directory));
    for (var i = 0; i < keyArr.length; i++) {
        var next = i + 1;       

        if (keyArr[i] && !keyArr[i].includes('Params')) {
            if (keyArr[next] && keyArr[next].includes('Params')) {
                directory[keyArr[next]] = directory[keyArr[next]].split(', ') !== [''] ? directory[keyArr[next]].split(', ') : undefined
                directory[keyArr[next]].push(directory[keyArr[i]])
            }
            var paramArr = directory[keyArr[next]] ? directory[keyArr[next]] : directory[keyArr[i]]
            switch (depKeyArr[j]) {
                case 'controller':
                    angular.module('app').controller(keyArr[i], paramArr)
                    break
                case 'directive':
                    angular.module('app').directive(keyArr[i], paramArr)
                    break
                case 'factory':
                    angular.module('app').factory(keyArr[i], paramArr)
                    break
                case 'filter':
                    angular.module('app').filter(keyArr[i], paramArr)
                    break
                case 'service':
                    angular.module('app').service(keyArr[i], paramArr)
                    break

            }
        }
    }
}

In this scenario, depKeyArr.length is 5, and keyArr.length is 42. Despite these values, both loops continue beyond the expected limits. Any insights on why this might be happening would be greatly appreciated.

Snippet above has been updated!

I have noticed mentions of i and j changing, however, in my debugging session they remain unchanged. Currently, j is at 5 with depKeyArr.length also at 5. Similarly, i is at 42 while keyArr.length stands at 42...yet the loops proceed further than expected, specifically stopping at the last case in the switch statement. This failure occurs when keyArr[i] is undefined.

In response to OBDM's suggestion, I incorporated angular.copy() to avoid modifying the array within the loop. However, the loop still executes when the condition should prevent it. What's more puzzling is that even the if condition doesn't halt the execution of the switch statement. It should not enter the following if:

if (!keyArr[i].includes('Params'))

as by that point, keyArr[i] is undefined.

Latest update -

Although I successfully managed to exit the inner loop with recent adjustments, the code continues to the switch statement and throws an error on keyArr[i] despite being within both loops and an if statement that evaluates to false.

Answer №1

In general, it is not recommended to set the stop condition of a loop with a "dynamic value," meaning a value that can be altered while the loop is running.

The code below illustrates how this can lead to an infinite loop:

for (var k = 0; k < numKeyArr.length; k++) {
   numKeyArr.push("something");
}

To avoid unpredictable behavior, it is better to store the stop condition in a variable like this:

var numKeyArrLen = numKeyArr.length;

for (var k = 0; k < numKeyArrLen; k++) {
   numKeyArr.push("something");
}

Answer №2

"I'm trying to figure out why my for loop is continuing even after the conditions have been met. The file I'm working with is quite large, so sharing it here isn't practical. Here's a snippet of the loops in question:"

I'm not exactly sure what the "//blah blah more code" refers to, but it's essential to ensure that any operations within that part do not involve changing the values of variables i and j. Typically, we iterate through variables like i, j, k, l, sequentially, so if there's another loop nested inside that section and accidentally alters j after i, it can cause unexpected behavior."

Answer №3

In a situation like this, it's important to recognize the unusual behavior that occurs when there is a failure to attach the final angular service in the loop.

After repeatedly reviewing the problem, I realized I needed to rethink my approach and challenge my assumptions. It turned out that my assumption of the loops completing successfully was incorrect, leading me to discover the root cause of the issue.

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