Fuck you, JavaScript.

0-js.md

TL;DR: type coercion is the devil.

Metadata

$ node -v
v0.12.2

1-null.js

$ node
> null < 1
true
> null > -1
true
> null < 0
false
> null > 0
false
> null == 0
false
> null + 0
0

2-undefined.js

$ node
> undefined < 1
false
> undefined > -1
false
> undefined < 0
false
> undefined > 0
false
> undefined == 0
false
> undefined == null
true

3-object.js

$ node
> obj = {}; obj++; obj
NaN
> obj = {}; obj--; obj
NaN
> obj = {}; obj += 1
'[object Object]1'
> obj = {}; obj -= 1
NaN

4-array.js

$ node
> arr = []; arr++; arr
1
> arr = []; arr--; arr
-1
> arr = []; arr += 1
'1'
> arr = []; arr -= 1
-1
> arr = []; arr += []
''

5-string.js

$ node
> '' == 0
true
> str = ''; str += 1
'1'
> str = ''; str -= 1
-1

Fuck You Javascript