如果再在地圖別的

Question

什麼是代表下面如果接着還有更簡潔的方式：

val result = scores.map(score => 
    if (score == 0) 
    ("retake", 1) 
    else if (score < 0) 
    ("fail", 1) 
    else 
    ("pass", 1) 
) 

Answer 1

模式與警衛匹配

scores map { 
    case 0 => "retake" -> 1 
    case x if x < 0 => "fail" -> 1 
    case _ => "pass" -> 1 
} 

Answer 2

使用模式匹配：

val result = scores.map { 
    case 0 => ("retake", 1) 
    case s if s < 0 => ("fail", 1) 
    case _ => ("pass", 1) 
}