小编Las*_*nis的帖子

为什么不在a.push(b)我的Array.reduce()? a=a.push(b)where b字符串中工作,转为a整数.？!

 getHighestValuesInFrequency: function(frequency) {
 //Input:var frequency = {mats: 1,john: 3,johan: 2,jacob: 3};
 //Output should become ['John','jacob']

var objKeys = Object.keys(frequency);
var highestVal = objKeys.reduce((a,b)=>
            {highestVal = (frequency[b] > a)? frequency[b] : a;
             return highestVal;},0);

var winner = objKeys.reduce((a,b)=>
      { a = (frequency[b] === highestVal)? a.push(b) : a;
        return a},[]);

return winner;  
 }                                  

我使用C作为Arduino控制器,我有一个包含静态变量的函数

int buttonReallyPressed(int i);

我想要该函数的多个实例,所以我这样做了:

typedef int (*ButtonDebounceFunction) ( int arg1);
ButtonDebounceFunction Button1Pressed = buttonReallyPressed;
ButtonDebounceFunction Button2Pressed = buttonReallyPressed;

我收到了函数int buttonReallyPressed(int i)的两个单独实例吗？

我想修改一个旧的C代码,它从命令行获取输入以获取从main内部定义的字符串的常量argv-vector.

我得到一个运行时异常

//void main(ac,av)
//char *av[]; 
void main()
{
    char *av[]= {"C:\\spice3f5.exe","input.cir","-r","output.txt",0};
    char  **tv;
    tv = av;
    tv++;
    **tv='-';// "Access violation writing location 0x00708edc."
    (*tv)[0] = '-';//Same runtime exception
}

这根本不应该发生......这是Visual C++ 2010中的一个错误吗？