JAVASCRIPT

js + before variable

// Operator + is a unary operator which converts 
// the value to a number. Below is a table with 
// corresponding results of using this operator for different values.

Value	+ (Value)
1	1
'-1'	-1
'3.14'	3.14
'3'	3
'0xAA'	170
true	1
false	0
null	0
'Infinity'	Infinity
'infinity'	NaN
'10a'	NaN
undefined	Nan
['Apple']	Nan
function(val){ return val }	NaN