Is there a one-liner to do the following
NSMutableArray *allpoints = [[NSMutableArray alloc] init];
for (NSMutableArray *arr in self.points)
[allpoints addObjectsFromArray:arr];
I have an array of arrays (self.points) and I am joining all of the objects in the subarrays into a single array.
NSArray *array1 = @[ @"a", @"b", @"c" ];
NSArray *array2 = @[ @"d", @"e", @"f" ];
NSArray *array3 = @[ array1, array2 ];
NSArray * flattenedArray = [array3 valueForKeyPath:@"@unionOfArrays.self"];
NSLog(@"flattenedArray: %@", flattenedArray);
Output:
flattenedArray: ( a, b, c, d, e, f )
allpoints = [self.points valueForKeyPath:@"@unionOfArrays.self"] to apply directly to the question (and add a mutableCopy if you really want that characteristic on allPoints).There is not a way to add all objects in an array of arrays (e.g., every NSMutableArray in self.points to another array without iterating through.
However, you could add a category to NSArray to do exactly what you're doing now, and then call it with one line later.
If you are initializing the array and adding objects at the same time then there is an initializer for that.
NSMutableArray *allpoints = [[NSMutableArray alloc] initWithArray:self.points];
If you already have the mutable array defined and you want to just append objects to the end then you can use the following.
[allpoints addObjectsFromArray:self.points];
self.points is an array containing more arrays—OP wants to add the elements from these arrays, not the arrays themselves.
I don't think there is a way to do this.
NSMutableArray *allpoints = [[NSMutableArray alloc] initWithArray:self.points]
would give you an array of the arrays, but there is no single line solution. I'd suggest writing a category that will do this for you so you can easily reuse it.
