如何用数组中的 2 个字符串替换 1 个字符串？

Question

Here's an example:

I have this array:

const chars = [ "ä", "t", "i" ]

and I'd like to achieve this outcome:

const chars = ["a", "e", "t", "i" ]

Basically, I'd like to replace some special chars:

• ä -> a, e
• ü -> u, e
• ö -> o, e

I've been trying to use a switch function like this:

    const charsArray = ["ä", "t", "i"]
    const replaceChars = (char) => {
          switch (char) {
            case "ä":
              return ("a", "e");
            default:
              return char;
          }
        };
    const cleanArray = charsArray.map((c) => {return replaceChars(c)}
    //output: ["e", "t", "i"] instead of: ["a","e", "t", "i"]

The problem: it only returns 1 value, so f.ex. for "ä" it only returns "e".

Any help is appreciated! Thanks!

Answer 1

you need to return array from function and use flatMap to combine it together:

 const charsArray = ["ä", "t", "i"] const replaceChars = (char) => { switch (char) { case "ä": return ["a", "e"]; default: return char; } }; const cleanArray = charsArray.flatMap((c) => replaceChars(c)); console.log(cleanArray);

Answer 2

you can join it into a string and then use the String.replace() method (and then split it into an array again):

 const charsArray = ["ä", "t", "i", "ü"]; const cleanArray = charsArray.join("").replace(/ä/g, "ae").replace(/ü/g, "ue") // you can chain as many.replace() methods as you want here.split(""); console.log(cleanArray);

Answer 3

Immediate answer: at case "ä": return ["a", "e"];

But this is not efficient, you might want to use a Map that gives you instant access.

 console.clear(); const chars = new Map(); chars.set("ä", "ae"); chars.set("ö", "oe"); const text = ["ä", "t", "i", "ö"]; const res = text.map(x => chars.get(x) || x).flatMap(x => x.split('')); console.log(res)