main.js

const isJapanPoint = name => {
    const regJapaneseplace = /[\p{sc=Hiragana}\p{sc=Han}]/u;
    return regJapaneseplace.test(name);
}

const searchTransfer = () => {
    const pointStr = document.querySelector("textarea").value;
    const pointArray = pointStr.split("\n").map((point) => point.trim()).filter(point => point !== "");
    if(pointArray.length < 2){
        alert("不正な入力です。")
        return;
    }
    //const text = pointArray.filter(point => point !== "") .join("\n| (徒歩)\n");
    let text = "";
    for(let i=0; i<pointArray.length; i+=1){
        text += pointArray[i];
        if(i === pointArray.length-1) break;
        const transportation = isJapanPoint(pointArray[i]) === isJapanPoint(pointArray[i+1]) ? "徒歩" : "水泳";
        text += `\n|(${transportation})\n`;
    }
    const output = document.querySelector("output");
    const button = document.querySelector("button");
    output.innerText = "検索中";
    button.disabled = true;
    const necessaryTime = 2000 + Math.random() * 3000;
    const timerID = setInterval(() => {
        output.innerText += ".";
    }, 700);
    setTimeout(() => {
        output.innerText = `${text}\n\n合計金額0円`;
        button.disabled = false;
        button.textContent = "再検索";
        clearInterval(timerID);
    }, necessaryTime);
}