如何删除for循环中的最后一个逗号? [英] How can I remove the last comma in my for loop?

问题描述

function currentLine(katzDeliLine) {
    if (katzDeliLine.length > 0) {
        var textToPrint = "The line is currently: "

        for (var crrLine = 0; crrLine < katzDeliLine.length; crrLine++) {

            textToPrint = textToPrint + (crrLine + 1) + ". " + katzDeliLine[crrLine] + ","

        }


        return textToPrint;
    } else {
        return "The line is empty"
    }
}

var lineofpeople = ["katrina", "kevin", "vincent"]

输出为: The line is currently: 1. katrina, 2. kevin, 3. vincent,

我正试图摆脱'vincent'之后的最后一个逗号

I'm trying to get rid of the last comma after 'vincent'

我尝试了一个if语句，并且还尝试了.join()方法.我不知道如何在代码中实现它们.

I tried an if statement, and I also tried the .join() method. I don't know how to implement them in the code.

推荐答案

您可以将前导数字与值映射，并用逗号将数组连接起来.

You could map the leading numbers with the value and join the array with comma.

function currentLine(array) {
    return array.length
        ? `The line is currently: ${array.map((v, i) => `${i + 1}. ${v}`).join(', ')}.`
        : "The line is empty.";
}

var lineofpeople = ["katrina", "kevin", "vincent"];

console.log(currentLine(lineofpeople));
console.log(currentLine([]));

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