ios - isEqual: and isKindOfClass: - Which is faster? -

ios - isEqual: and isKindOfClass: - Which is faster? -

for various reasons, in order maintain array's indexes aligned other things, have [nsnull null] within array. this:

nsarray *arr = @[obj1, obj2, obj3, [nsnull null], obj4];

there 2 methods i'm considering using when iterating through array create sure ignore null value, i'm not sure faster.

method 1

for (id obj in arr) { if (![[nsnull null] isequal:obj]) { //do stiff } }

method 2

for (id obj in arr) { if ([obj iskindofclass:[myobject class]]) { //do stiff } }

my question is: since i'm iterating through array appropriately handle tiled scroll view (therefore it's beingness executed many times user scrolls , it's crucial runs possible), which 1 of these methods faster?

[nsnull null] singleton, easiest things check if object pointer same.

if want fast, this:

for (id obj in arr) { if ([nsnull null]!=obj) { //do stuff } }

but it's unlikely you'll see difference visual interface, talking very little difference.

an alternative discussed in comments set [nsnull null] in local variable speed checks, it's possible compiler you, i'm putting here reference:

nsobject *null_obj=[nsnull null]; (id obj in arr) { if (null_obj!=obj) { //do stuff } }

ios objective-c arrays nsnull