Javascript swap characters in string

Question

Let\'s say I have a string like "abcabcabc" and I want the positions of \'a\'s and \'b\'s swapped so that I end up with "bacbacbac"

Answer 1

Try this :

str.replace(/[ab]/g, function($1) { return $1 === 'a' ? 'b' : 'a' })

example:

console.log("abcabcabc".replace(/[ab]/g, function($1) { return $1 === 'a' ? 'b' : 'a' }))

Answer 2

replace function accepts a string as the second parameter.

"abcabcabc".replace( /ab/g, "ba")

Answer 3

I use this method when I need to swap long list of characters\words\strings!

The method also prevents strings already replaced to be replaced again, Example:

String = "AAABBBCCC BBB"

Replace "AAABBBCCC" with "BBB", then, "BBB" with "DDD"

Final String = "BBB DDD"

Note that, only "BBB" from the original string is replaced to "DDD"! The "BBB" replaced from "AAABBBCCC" is not re-replaced to "DDD"!

Answer 4

You can swap them (if they're always adjacent) by using a split/join combo:

console.log("abcabcabc".split("ab").join("ba"))

And in keeping with the split/join method, here's a way to swap them as individual characters (although it becomes significantly less readable):

console.log("aabbccaabbcc".split("a").map(s => s.split("b").join("a")).join("b"));

Answer 5

Use a direct replace using Regex:

var result = "abcabcabc".replace( /ab/g, "ba");
console.log(result);