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