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TypeError: invalid Array.prototype.sort argument

The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument ofArray.prototype.sort() (and its related methods:Array.prototype.toSorted(),TypedArray.prototype.sort(),TypedArray.prototype.toSorted()) isn't eitherundefined or a function which compares its operands.

Message

TypeError: The comparison function must be either a function or undefined (V8-based)TypeError: invalid Array.prototype.sort argument (Firefox)TypeError: non-function passed to Array.prototype.toSorted (Firefox)TypeError: invalid %TypedArray%.prototype.sort argument (Firefox)TypeError: Array.prototype.sort requires the comparator argument to be a function or undefined (Safari)TypeError: Array.prototype.toSorted requires the comparator argument to be a function or undefined (Safari)TypeError: TypedArray.prototype.sort requires the comparator argument to be a function or undefined (Safari)TypeError: TypedArray.prototype.toSorted requires the comparator argument to be a function or undefined (Safari)

Error type

What went wrong?

The argument ofArray.prototype.sort() (and its related methods:Array.prototype.toSorted(),TypedArray.prototype.sort(),TypedArray.prototype.toSorted()) is expected to be eitherundefined or a function which compares its operands.

Examples

Invalid cases

js
[1, 3, 2].sort(5); // TypeErrorstudents.toSorted("name"); // TypeError

Valid cases

js
[1, 3, 2].sort(); // [1, 2, 3][1, 3, 2].sort((a, b) => a - b); // [1, 2, 3]students.toSorted((a, b) => a.name.localeCompare(b.name));

See also

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