| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #import "NSArray+Extensions.h" |
| |
| @implementation NSArray (WALTExtensions) |
| - (NSNumber *)medianValue { |
| NSArray<NSNumber *> *sorted = [self sortedArrayUsingSelector:@selector(compare:)]; |
| const NSUInteger count = sorted.count; |
| if (count == 0) { |
| return nil; |
| } |
| |
| if (count % 2) { |
| return [sorted objectAtIndex:count / 2]; |
| } else { |
| return [NSNumber numberWithDouble:0.5 * ([sorted objectAtIndex:count / 2].doubleValue + |
| [sorted objectAtIndex:count / 2 - 1].doubleValue)]; |
| } |
| } |
| @end |