javascript - Can this type checks with "object" be improved? -

if (typeof !== "object" && typeof b !== "object") {     return == b; } ... // check pairwise equality of object & b using `for in` 

is same

if (typeof !== "object") {     return == b; } 

is there b typeof b === "object" change semantics?

are there horrible edge cases should aware of? comparisons between object , native type have non-intuitive boolean equality or disequality? including bugs in browser (i mean ie6!)

the second check not quite same first, no, because javascript weakly typed @ least consider ".tostring() effect", others. example these fail first check, pass in second:

var = "[object object]"; var b = {}; 

or, bit simpler (showing case may want consider...but passes both checks):

var = 0; var b = "0"; 

one fix value and type check === which strict comparison operator, type checking well...but i'm not entirely sure that's you're after, since current check explicitly "not object".