This JavaScript exception can’t delete non-configurable array element that occurs if there is an attempt to short array-length, and any one of the array’s elements is non-configurable.
Message:
TypeError: can't delete non-configurable array element (Firefox) TypeError: Cannot delete property '2' of [object Array] (Chrome)
Error Type:
TypeError
Cause of error: When one of the array’s elements is non-configurable and code tries to shorten the length of the array.
Example 1: In this example, the array properties are non-configurable and an attempt was made to delete the property by shortening the array length.
Javascript
let array = [];Object.defineProperty(array, 1, { value: 4 });Object.defineProperty(array, 2, { value: "4" });array.length = 1; // Error here |
Output:
TypeError: can't delete non-configurable array element
Example 2: In this example, the array properties are non-configurable and an attempt was made to delete the property by shortening the array length.
Javascript
let array = ['a', 'b', 'c'];Object.seal(array);array.length = 1; // Error here |
Output:
TypeError: can't delete non-configurable array element
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