JS-is-awesome.md

JS is awesome

Node v8.11.4 Lets try understand this shit.

a === b

It's easy

a\b	0	'0'	null	undefined	[]	{}
0	true	false	false	false	false	false
'0'		true	false	false	false	false
null			true	false	false	false
undefined				true	false	false
[]					false	false
{}						false

a == b

Normal

a\b	0	'0'	null	undefined	[]	{}
0	true	true	false	false	true	false
'0'		true	false	false	false	false
null			true	true	false	false
undefined				true	false	false
[]					false	false
{}						false

a > b

okay

a\b	0	'0'	null	undefined	[]	{}
0	false	false	false	false	false	false
'0'		false	false	false	true	false
null			false	false	false	false
undefined				false	false	false
[]					false	false
{}						false

a >= b

Look the last 2 tables above

a\b	0	'0'	null	undefined	[]	{}
0	true	true	true	false	true	false
'0'		true	true	false	true	false
null			true	false	true	false
undefined				false	false	false
[]					true	false
{}						true

a < b

a\b	0	'0'	null	undefined	[]	{}
0	false	false	false	false	false	false
'0'		false	false	false	false	true
null			false	false	false	false
undefined				false	false	false
[]					false	true
{}						false

a <= b

`a\b	0	'0'	null	undefined	[]	{}
0	true	true	true	false	true	false
'0'		true	true	false	false	true
null			true	false	true	false
undefined				false	false	false
[]					true	true
{}						true

a - b

a\b	0	'0'	null	undefined	[]	{}
0	0	0	0	NaN	0	NaN
'0'	0	0	0	NaN	0	NaN
null	0	0	0	NaN	0	NaN
undefined	NaN	NaN	NaN	NaN	NaN	NaN
[]	0	0	0	NaN	0	NaN
{}	-0	-0	-0	NaN	-0	NaN

a + b

Concatenation of strings

a\b	0	'0'	null	undefined	[]	{}
0	0	'00'	0	NaN	'0'	'0[object Object]'
'0'	'00'	'00'	'0null'	'0undefined'	'0'	'0[object Object]'
null	0	'null0'	0	NaN	'null'	'null[object Object]'
undefined	NaN	'undefined0'	NaN	NaN	'undefined'	'undefined[object Object]'
[]	'0'	'0'	'null'	'undefined'	''	'[object Object]'
{}	0	0	0	NaN	0	'[object Object][object Object]'