How Can I Replace Multiple Strings Simultaneously in JavaScript?

Replacing Multiple Strings Simultaneously in JavaScript

In JavaScript, replacing multiple strings with multiple other strings in a single operation is not straightforward using the replace() method alone. To achieve the desired result, alternative approaches are necessary.

Specific Solution:

One method involves using a function to handle each replacement.

var str = "I have a cat, a dog, and a goat.";
var mapObj = {
   cat:"dog",
   dog:"goat",
   goat:"cat"
};
str = str.replace(/cat|dog|goat/gi, function(matched){
  return mapObj[matched];
});

Generalizing the Solution:

To make this solution more flexible, a dynamic regular expression can be generated using the Object.keys() method and the corresponding map object.

var re = new RegExp(Object.keys(mapObj).join("|"),"gi");
str = str.replace(re, function(matched){
  return mapObj[matched.toLowerCase()];
});

Now, additions or changes to the replacements can be easily done by modifying the map object.

Reusable Function:

For reusability, this logic can be abstracted into a standalone function:

function replaceAll(str,mapObj){
    var re = new RegExp(Object.keys(mapObj).join("|"),"gi");

    return str.replace(re, function(matched){
        return mapObj[matched.toLowerCase()];
    });
}

This function can be called with the string to be transformed and the desired replacements as input, returning the modified string.

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