RFE: add "all" / "every" method to collections

[marcpalmer]

I miss this simple addition:

 - (BOOL)all:(BOOL (^)(id object))condition;

i.e:

NSArray *list = @['a', 'b', 'c'];
BOOL allMatch = [list all:^(id object) { return id != nil }];
assert( allMatch );

[marcpalmer]

Sorry, ditto "any" which returns YES if any one of the elements matches the condition, and returns eagerly as soon as the first match is found.

[supermarin]

Isn't that -select ?

[marcpalmer]

No, it's detect with BOOL result. Detect works but this is nice counterpart to every :)

[subramanianv]

Is this functionality already in there ?

[supermarin]

there's a PR #69, so closing this one