objective c - Why can't I create an NSMutableArray of integers? -

is format not allowed in objective c?

nsmutablearray arraya=[0,1,2,3,4,5]; 

is way adding 1 integer @ time?

there 2 parts question:

integers value-types , nsmutablearray can have object-types in it.

as comment said, there's magic syntax:

@1 

which says "i know primitive, please oh mighty compiler auto-magically make object me."

similarly, there's syntax:

@[ ... ] 

which converts c-array objective-c nsarray [subclass].

so this:

nsarray * array = @[ @1 , @2 , @3 , ... ] ; 

which give array of numbers. you'd have use them though:

for ( nsnumber * number in array ) {     nslog ( @"this value %i" , (int)number.intvalue ) ;     // alternatively, exact same thing:     nslog ( @"this value %i" , (int)[number intvalue] ) ; } 

if wanted make mutable:

nsmutablearray * array = [ @[@1,@2,@3] mutablecopy ] ; 

other languages (like python) have syntax want built-in because own language , can internally represent object-type or value-type. don't have distinguish between them, , pay cost in terms of optimizability.

objective-c based on c , must still conform c. furthermore, syntax must still conform c, , number , [] tokens have specific meanings in c , c++ can't re-define them. therefore, used favorite syntax: '@' sign, patterning after strings.

char const * str = "abc" ; nsstring * str = @"abc" ;  int = 1 ; nsnumber * = @1 ;  int arr[] = { 1 , 2 , 3 } ; nsarray * arr = @[ @1 , @2 , @3 ] ;  // note: there's no concept of dictionary in c nsdictionary * dict = @{ @"a":@1 , @"b":@2 } ; 

this called "boxing" because you're boxing primitive object.

note inner part number doesn't have literal:

int = 5 ; nsnumber * ii = @(i) ;  char const* str = "abc" ; nsstring * string = @(str) ; 

see more information: http://clang.llvm.org/docs/objectivecliterals.html