Ninja Object Properties in Scripting languages

Submitted by hemanth on Wed, 06/06/2012 - 10:05

10 hours ago, came across atrick-wied's ninja object properties in JavaScript, that speaks of code as below.

var x = {};
x[""] = 1;
x[" "] = 2;
x["  "] = 3;
 
console.log(x)
 
x= {}
 
x[String.fromCharCode(1)] = 1;
x[String.fromCharCode(2)] = 2;
x[String.fromCharCode(3)] = 3;
x[String.fromCharCode(4)] = 4;
 
console.log(x);

This is not very obfuscated JS-code, but indeed fun to see spaces as object properties and space as ✐

On the same lines out of interest tried exploring the same property in other languages

Python:

>>> class A(object): pass... 
>>> a = A()
>>> setattr(a,' ',1)
>>> setattr(a,'  ',2)
>>> setattr(a,'',3)
>>> getattr(a,'')
3

Ruby:

irb(main):001:0> a={}
=> {}
irb(main):002:0> a[' ']=1
=> 1i
rb(main):003:0> a['  ']=2   
=> 2
irb(main):004:0> a[' ']
=> 1
irb(main):005:0> a['  ']             
=> 2

Perl:

$x={};
$x->{' '} = 1;
say $x->{' '};
$x->{'  '} = 2;
say $x->{'  '};
$x->{'  '} = 3;
say $x->{'  '};

So it appears most of the major scripting languages have the ninja object property in them!

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