Why does calling fn.length in JavaScript return the number of named arguments fn has?
> function fn () { }
> x.length
0
> function fn (a) { }
> x.length
1
> function fn (a,b,c) { }
> x.length
3
This behavior is quite peculiar. I wonder what the explanation behind it is.
According to MDN's guide:
The length attribute represents the expected number of arguments for a function.
Referencing Microsoft's information:
This property retrieves the quantity of arguments specified within a function.
As per the ECMAScript 2015 specification:
The length value is an integer indicating the typical number of expected arguments for the function.
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