NSMutableArray+YGHelper

Example.m

[sources removeObjectsWithPredicate:^BOOL(id obj){
  LCFTSource *source = (LCFTSource *)obj;
  return [self.hiddenSourceIDs containsObject:source.sourceID];
}];

NSMutableArray+YGHelper.h

#import <Foundation/Foundation.h>

@interface NSMutableArray (YGHelper)

- (void)removeObjectsWithPredicate:(BOOL (^)(id obj))predicate;

@end

NSMutableArray+YGHelper.m

#import "NSMutableArray+YGHelper.h"

@implementation NSMutableArray (YGHelper)

- (void)removeObjectsWithPredicate:(BOOL (^)(id obj))predicate {
    if (predicate != nil) {
        NSMutableArray *newArray = [[NSMutableArray alloc] initWithCapacity:self.count];
        for (id obj in self) {
            BOOL shouldRemove = predicate(obj);
            if (!shouldRemove) {
                [newArray addObject:obj];
            }
        }
        [self setArray:newArray];
    }
}

@end