leetCode657.js

/**
 * @param {string} moves
 * @return {boolean}
 */
var judgeCircle = function(moves) {
    var x = 0 , y = 0;
    var ary = moves.split('');
    for(var i = 0; i< ary.length ; i++){
        switch(ary[i]){
            case 'R':
                x += 1;
                break;
            case 'L':
                x -= 1;
                break;
            case 'U':
                y -= 1;
                break;
            case 'D':
                y += 1;
                break;
        }
    }
    
    return (x == 0 && x === y) ? 1 : 0;
};