棒球比赛

[pwstrick]

682. 棒球比赛

/**
 * @param {string[]} ops
 * @return {number}
 */
var calPoints = function(ops) {
    const stack = [];
    ops.forEach(value => {
        let len = stack.length,
            sum;
        if(value == "+" && len > 1) {
            sum = stack[len-1] + stack[len-2];
            stack.push(sum);
        }else if(value == "D" && len > 0) {
            sum = stack[len-1] * 2;
            stack.push(sum);
        }else if(value == "C" && len > 0) {
            stack.pop();
        }else {
            stack.push(parseInt(value));
        }
    });
    return stack.reduce((acc, current) => acc += current);
};