Why Null==0 is false in JavaScript and null>=0 to True

At work we are constantly writing code, writing JavaScript, very little time for conceptual research. I have nothing to do today, I studied the relationship between "null" and "0". I hope you have seen the end of the harvest.

Alert (null>=0)

What does the above code pop up? False? True? is actually true. So why is it? Why is "Null>=0" true? When Null>=0, a strong switch to a numeric type. When making a null>=0 comparison, it is the answer that is obtained by comparing null<0, and if A=b is false, if a=b is true, that is, 0<0 is false, or null<0 is false, then null>0 is true. So null>=0 is true.

Alert (null==0)

What does the code of the face pop up? False? True? is actually false. Null==0 "is a special treatment that does not turn into a numeric type and does not convert to a numeric value, but if the left side is a string to the right, the value is converted. "NULL" is an object (empty object with no properties and methods). and "0" is a number. Previously said "= =" does not convert the type, just comparison. So, false.

Why "Null==0" is false, but "null>=0" is true? This little problem is analyzed here. In the process of analysis I also learned a lot of things, I think we can see when there is a certain harvest it. Above all is the personal opinion, if has any understanding not to be in place, welcome to propose, everybody studies together ha.

Attach some reference

false false Td> Td>

=	0	' 0 '	[0]	[]	{}	'	NULL	[NULL]	undefined	NaN	[NaN]	' A '	Infinity	1	' 1 '	[1]
0	true	true	true	true	false	true	false	true	false	false	false	false	false	false	false
' 0 '	true	true	true	false	false	Span class= "false" >false	false	false	false	false	false	false	false	false	false	false
[0]	true	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false
[]	true	false	false	false	false	true	false	false	false	false	false	false	false	false	false	false
{}	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
'	true	false	false	true	false	true	false	true	false	false	false	false	false	false	false	false
null	false	false	false	false	false	false	true	False	true	false	false	false	false	false	false	false
[null]	true	false	false	false	false	true	false		false	false	false	false	false	false	false	false
undefined	false	false	false	false	false	false	true	false	true	false	Span class= "false" >false	false	false	false	false	false
NaN	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
[NaN]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
' A '	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false	false
Infinity	false	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false
1	false	false	false	false	false	false	false	false	false	false	false	false	true	true	true
' 1 '	false	false	false	false	false	false	false	false	false	false	false	false	false	true	true	true
[1]	false	false	false	false	false	false	false	false	false	false	false	false	false	true	true	false

false false Td> Td>

= =	0	' 0 '	[0]	[]	{}	'	NULL	[NULL]	undefined	NaN	[NaN]	' A '	Infinity	1	' 1 '	[1]
0	true	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
' 0 '	false	true	false	false	false	false	false	false	false	false	false	false	false	false	false
[0]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
[]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
{}	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
'	false	false	false	false	false	true	false	false	false	false	false	false	false	false	false	false
null	false	false	false	false	false	false	true	False	false	false	false	false	false	false	false	false
[null]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
undefined	false	false	false	false	false	false	false	false	true	false	Span class= "false" >false	false	false	false	false	false
NaN	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
[NaN]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false
' A '	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false	false
Infinity	false	false	false	false	false	false	false	false	false	false	false	false	true	false	false	false
1	false	false	false	false	false	false	false	false	false	false	false	false	true	false	false
' 1 '	false	false	false	false	false	false	false	false	false	false	false	false	false	false	true	false
[1]	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false	false

" ' Td> "

+	0	' 0 '	[0]	[]	{}	'	NULL	[NULL]	undefined	NaN	[NaN]	' A '	Infinity	1	' 1 '	[1]
0	0	'	' 0 '	' 0{} '	' 0 '	0	' 0 '	nan	nan	' 0NaN '	' 0a '	infinity	1
' 0 '	'			' 0 '	' 0{} '			' 0 '	' 0undefined '	' 0NaN '		' 0a '		'	'	'
[0]		"		' 0 '	' 0{} '			' 0 '	' 0undefined '	' 0NaN '		' 0a '		'	'	'
[]	' 0 '	' 0 '	' 0 '	"	' {} '	Span class= "string" "	' null '	"		' NaN '	' NaN '	' a '	' Infinity '	' 1 '	' 1 '
{}	' {}0 '	' {}0 '	' {}0 '	' {} '	' {} '	' {} '	' {}null '		' {}undefined '	' {}nan '	' {}nan '	' {}a '	' {}infinity '			' {}1 '
'	' 0 '	' 0 '	' 0 '	"	' {} '	Span class= "string" "	' null '	"		' NaN '	' NaN '	' a '	' Infinity '	' 1 '	' 1 '
null	0	' null0 '	' null0 '	' null '	' null{} ' /span>	' null '	0	' null '	nan	nan	' Nullnan '	' nulla '	infinity	1	' null1 '
[null]	0 '	' 0 '	' 0 '	"	' {} '	' null '		' undefined '	' NaN '	Span class= "string" > ' NaN '	' a '		' 1 '	' 1 '	' 1 '
undefined	nan	' undefined0 '	' undefined0 '	' undefined '	Span class= "string" > ' undefined{} '	' undefined '	nan	' undefined '	nan	nan	' Undefinednan '	' Undefineda '	nan	nan	' undefined1 '	' undefined1 '
NaN	nan	' NaN0 '	' NaN0 '	' NaN '	' nan{} '	' NaN '	nan	' NaN '	nan	nan	Span class= "string" > ' Nannan '	' NaNa '	nan	nan	' NaN1 '	' NaN1 '
[NaN]	' NaN0 '	' NaN0 '	' NaN0 '	' NaN '	' nan{} '	' NaN '	' nannull '	' NaN '	' nanundefined '	" Nannan '	' Nannan '	' NaNa '	' naninfinity '	' NaN1 '	' NaN1 '	' NaN1 '
' A '	' A0 '	' A0 '	' A0 '	' a '	' a{} '	' a '	' anull '	' a '	' aundefined '	' Anan '	' Anan '	' AA '	' ainfinity '	' A1 '	' A1 '	' A1 '
Infinity	infinity	' Infinity0 ' /td>	' Infinity0 '	' Infinity '	' infinity{} '	' Infinity '	infinity	' Infinity '	nan	nan	' Infinitynan '	' Infinitya '	infinity	infinity	' Infinity1 '	' Infinity1 '
1	1	"	'	' 1 '	' 1{} '	' 1 '	1	' 1 '	nan	nan	' 1NaN '	' 1a '	infinity	2	' one '	' one '
' 1 '	"	""		' 1 '	' 1{} '			' 1 '	' 1undefined '	' 1NaN '		' 1a '		"	"	' one '
[1]	' '	'		' 1 '	' 1{} '			' 1 '	' 1undefined '	' 1NaN '		' 1a '		"	"	' one '

*	0	' 0 '	[0]	[]	{}	'	NULL	[NULL]	undefined	NaN	[NaN]	' A '	Infinity	1	' 1 '	[1]
0	0	0	0	0	nan	0	0	0	nan	nan	nan	nan	nan	0	0	0
' 0 '	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	nan		0	0
[0]	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	nan		0	0
[]	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	nan		0	0
{}	nan	nan	nan	nan	nan	Span class= "number" >nan	nan	nan	nan	nan		nan	nan	nan	nan	nan
'	0	0
null	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	nan		0	0
[null]	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	nan		0	0
undefined	nan	nan	nan	nan	nan	nan	nan		nan	nan	nan	nan	nan	Span class= "number" >nan	nan	nan
NaN	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan
[NaN]	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan
' A '	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan
Infinity	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	nan	infinity	infinity	infinity	infinity
1	0	0	0	0	nan	0	0	0	nan	nan	nan	nan	infinity	1	1	1
' 1 '	0	0	0	0	nan	0	0	0	Span class= "number" >nan	nan	nan	nan	infinity	1	1	1
[1]	0	0	0	0	NaN	0	0	0	NaN	NaN	NaN	NaN	Infinity	1	1	1