Attempting to add an element to an array results in an endless cycle

Here is a jsfiddle example showcasing the issue, but proceed with caution as it contains an infinite loop that can cause the browser tab to slow down and eventually freeze when the console is opened: https://jsfiddle.net/evx1j6yf/1/

Array Data:

days: [
  "monday",
  "tuesday",
  "wednesday",
  "thursday",
  "friday",
  "saturday"
],

openingDays: []

Template Code:

{% for day in days %}
    {[ formatDays(day) ]}
{% endfor %}

formatDays Function:

 formatDays(day) {
     message = translateDays(day);
     openingDays.push(message);
 }

Expected Behavior: The second array should contain a duplicate of the days from the first array.
Actual Outcome: Instead, there is an endless repetition after the last day without any breaks.

Console Output:

["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", ...

Answer №1

The Issue: I am encountering an infinite loop where the loop keeps repeating itself endlessly after reaching the last day.

The reason behind this problem is that each time the formatDays function is called, it triggers a re-render due to the changes in the data displayed within the template. As formatDays is a method and directly used in the template using {{}}, it gets called during every re-render, resulting in the endless loop.

My Expectation: I expected my second array to be populated with a duplicate of the days.

I have made corrections to your JSFiddle.

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