如何使用查找表來反映某些輸出？

Question

我想根據他們有多少代理來呈現某些字符串......例如。

第 1 層：1-4 個代理

第 2 層：5-9 名特工

第 3 層：10 多個代理

---

如果用戶有 4 個代理......它應該呈現“ TIER 1 1 more agent to access Tier 2”

如果用戶有 6 個代理......它應該呈現“ TIER 2 4 more agent to access Tier 3”

如果一個用戶有超過 10 個代理......它應該呈現“第 3層您已達到最高層！”

currentTier(agentsCount) {
    if (agentsCount <= 4) {
        return 1;
    } else if (agentsCount >= 5 || agentsCount <= 9) {
        return 2;
    } else if (agentsCount >= 10) {
        return 3;
    }
}

nextTier(agentsCount) {
    let currentTier = this.currentTier(agentsCount);

    if (currentTier === 1) {
        return 2;
    } else if (currentTier === 2) {
        return 3;
    } else if (currentTier === 3) {
        return false;
    }
}

toNextTierMessage(agentsCount) {
    let nextTier = this.nextTier(agentsCount),
        toNextTier = 0;

    let currentTier = this.currentTier(agentsCount);
    if (currentTier === 1) {
        toNextTier = 5 - agentsCount;
    } else if (currentTier === 2) {
        toNextTier = 10 - agentsCount;
    }

    if (currentTier <= 2) {
        return toNextTier+ ' more agents to access Tier '+nextTier;
    } else if (currentTier >= 3) {
        return 'You\'ve reached the highest tier!';
    }
}

Answer 1

這個怎么樣：

function nextLevelMessage(agents) {
  return agents< 5?"TIER 1. "+( 5-agents)+" more agent(s) to access Tier 2.":
         agents<10?"TIER 2. "+(10-agents)+" more agent(s) to access Tier 3.":
                   "TIER 3. You've reached the highest tier!";
}

檢查代理是否為0或未通過任何內容...

Answer 2

如果小於 5，我們已經返回 1，因此無需再次測試；如果小於 10，我們已經返回 2，因此我們可以捕獲 3。

const currentTier = agentsCount => agentsCount <= 4 ? 1 : agentsCount <= 9 ? 2 : 3;