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Javascript – How to remove all emojis from a string if they are not equal to any of the ones in the object?

How to remove all emojis from a string if they are not equal to any of the ones in the object?
For example:

let allowedEmojis = {
  '😀': 50,
  '😂': 150,
  '🥳': 500
};

function filterEmojis() {
  // what should I type here?
}

let str = "Helloo 😀😂🥳😡";
str = filterEmojis(str);

console.log(str); // Helloo 😀😂🥳
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2

Answers


  1. 0 
    function filterEmojis(text: string): string {
    const emojiPattern = /[p{Emoji}]/gu;
    const allowedSet = new Set(Object.keys(allowedEmojis));
    let result = '';

    for (const letter of text) {
        if (emojiPattern.test(letter) && !allowedSet.has(letter)) {
            continue;
        }
        result += letter;
    }
    return result;
}

    The regex might not pass for all Emojis but this is a simple solution to the problem.

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  2. 0

    Another, simpler, solution would be to use the callback functionality of String.replace():

    const allowedEmojis = {
  '😀': 50,
  '😂': 150,
  '🥳': 500,
};

str="Helloo 😀😂🥳😡";

console.log(str.replace(/p{Emoji}/ug, a=>allowedEmojis[a]?a:""))
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