[JS][7kyu] Rock Paper Scissors Oracle

codewars/7kyu/rock-paper-scissors-oracle/koronya.js

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+// [JS][7kyu] Rock Paper Scissors Oracle
+// rock-paper-scissors-oracle
+// https://www.codewars.com/kata/580535462e7b330bd300003d/train/javascript
+
+const isWin = (gesture1, gesture2) => {
+  if (gesture1 === 'rock' && gesture2 === 'scissors') {
+    return true
+  }
+  if (gesture1 === 'paper' && gesture2 === 'rock') {
+    return true
+  }
+  if (gesture1 === 'scissors' && gesture2 === 'paper') {
+    return true
+  }
+  return false
+}
+
+const getScore = (gesture1, gesture2) => {
+  if (gesture1 === gesture2) {
+    return 0
+  }
+  if (isWin(gesture1, gesture2)) {
+    return 1
+  }
+  return -1
+}
+
+const oracle = (gestures) => {
+  const rockScore = gestures.reduce((score, gesture) => score + getScore('rock', gesture), 0)
+  const paperScore = gestures.reduce((score, gesture) => score + getScore('paper', gesture), 0)
+  const scissorsScore = gestures.reduce((score, gesture) => score + getScore('scissors', gesture), 0)
+  if (rockScore === paperScore && paperScore === scissorsScore) {
+    return 'tie'
+  }
+  const resultArr = []
+  if (rockScore > 0) {
+    resultArr.push('rock')
+  }
+  if (paperScore > 0) {
+    resultArr.push('paper')
+  }
+  if (scissorsScore > 0) {
+    resultArr.push('scissors')
+  }
+
+  return resultArr.join('/')
+}
+
+// oracle(['rock', 'paper', 'scissors', 'rock']) === 'paper'
+// oracle(['rock', 'paper', 'scissors']) === 'tie'
+// oracle(['rock', 'paper', 'paper', 'scissors', 'scissors']) === 'scissors'
+// oracle(['paper', 'scissors', 'scissors']) === 'rock/scissors'
+// oracle(['paper', 'paper', 'paper', 'rock', 'rock', 'paper', 'paper', 'rock'])