题解 | #坐标移动#

这道题唯一可能存在的难点就是如何判断是不是合法的坐标

let list=['A','D','W','S']
console.log(readline().split(';').reduce((pre,cur)=>{
    if(cur.length==2&&list.indexOf(cur[0])>=0&&!isNaN(cur[1])){
        return move(pre,cur[0],parseInt(cur[1]))
    }else if(cur.length==3&&list.indexOf(cur[0])>=0&&!isNaN(cur[1])&&!isNaN(cur[2])){
        return move(pre,cur[0],parseInt(cur[1]+cur[2]))
    }
    return pre
},[0,0]).join(','))
function move(pre,type,d){
    if(type=='A'){
        pre[0]-=d
    }else if(type=='S'){
        pre[1]-=d
    }else if(type=='W'){
        pre[1]+=d
    }else if(type='D'){
        pre[0]+=d     
    }
    return pre
}