[wp-trac] [WordPress Trac] #40954: Create Category within posts screen error

[WordPress Trac]

#40954: Create Category within posts screen error
-------------------------------+-------------------------
 Reporter:  cfastenrath        |       Owner:  (none)
     Type:  defect (bug)       |      Status:  closed
 Priority:  normal             |   Milestone:
Component:  Posts, Post Types  |     Version:  4.8
 Severity:  normal             |  Resolution:  invalid
 Keywords:  close              |     Focuses:  javascript
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Comment (by hamzadevpro):

 To handle the JavaScript error for handling AJAX responses when creating a
 new category in the "create posts" screen of WordPress, you’re right in
 focusing on checking for undefined or null values before attempting to
 access properties. The provided function Object.c is designed to safely
 copy values from one object or array (b) to another (a). However, if the
 AJAX response is sometimes returning null or undefined, you can add some
 additional checks to ensure that the function behaves safely without
 throwing errors.


 {{{
 Object.c = function(a, b) {
     // Check if both `a` and `b` are defined and of the same constructor
 type
     if (a && b && a.constructor === b.constructor) {
         // Clear array if `a` has length and is an array
         if (Array.isArray(a) && a.length) {
             a.length = 0;
         }
         // Copy elements from `b` to `a` if `b` has length and is an array
         for (var c = 0; c < (b.length || 0); c++) {
             a[c] = b[c];
         }
         a.length = b.length || 0;
     } else {
         // Use Array.slice only if `b` is an array-like object
         a = b && typeof b.length === 'number' ?
 Array.prototype.slice.call(b) : b;
     }
     return a;
 };
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/40954#comment:4>
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