題目
難度：easy
Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the original place.
The move sequence is represented by a string. And each move is represent by a character. The valid robot moves are R (Right), L (Left), U (Up) and D (down). The output should be true or false representing whether the robot makes a circle.
Example 1:
Input: "UD"
Output: true
Example 2:
Input: "LL"
Output: false
第一次解法
/**
* @param {string} moves
* @return {boolean}
*/
var judgeCircle = function(moves) {
let lNum = 0;
let rNum = 0;
let uNum = 0;
let dNum = 0;
moves.split('').filter((char)=>{
switch (char)
{
case "L":
return lNum++
break
case "R":
return rNum++
break
case "U":
return uNum++
break
case "D":
return dNum++
break
}
})
if(lNum === rNum && uNum === dNum){
return true
}else{
return false
}
};
# runtime : 82ms
