记录NSArray 快速求和、平均值、最大值、最小值

// 快速求和、平均值、最大值、最小值
NSArray *array = @[@1,@2,@3,@4,@5.3];

NSNumber *sum = [array valueForKeyPath:@"@sum.intValue"];
float avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
int max = [[array valueForKeyPath:@"@max.intValue"] intValue];
int min = [[array valueForKeyPath:@"@min.intValue"] intValue];

NSLog(@"%@  %f  %d  %d ",sum,avg,max,min);

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