1，遍历数组
2，使用reduce高阶函数
let arr = [2,3,4,5]
let result = arr.reduce(0) {
return $0 + $1
}
print(result) //14
3，通过KVC实现
OC :
NSArray *values = @[@72,@78,@70,@72,@73,@76];
NSNumber *avg = [values valueForKeyPath:@"@avg.self"];
NSNumber *sum = [values valueForKeyPath:@"@sum.self"];
NSNumber *max = [values valueForKeyPath:@"@max.self"];
NSNumber *min = [values valueForKeyPath:@"@min.self"];
swift :
let avg = values.value(forKeyPath: "@avg.self")
let sum = values.value(forKeyPath: "@sum.self")
let max = values.value(forKeyPath: "@max.self")
let min = values.value(forKeyPath: "@min.self")
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