TypeError: invalid Array.prototype.sort argument
The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() isn't either undefined or a function which compares its operands.
Message
TypeError: argument is not a function object (Edge)
TypeError: invalid Array.prototype.sort argument (Firefox)
Error type
What went wrong?
The argument of Array.prototype.sort() is expected to be either undefined or a function which compares its operands.
Examples
Invalid cases
[1, 3, 2].sort(5); // TypeError
var cmp = { asc: (x, y) => x >= y, dsc: (x, y) => x <= y };
[1, 3, 2].sort(cmp[this.key] || 'asc'); // TypeError
Valid cases
[1, 3, 2].sort(); // [1, 2, 3]
var cmp = { asc: (x, y) => x >= y, dsc: (x, y) => x <= y };
[1, 3, 2].sort(cmp[this.key || 'asc']); // [1, 2, 3]