.replace is not a function error in javascript

Question

in javascript the following is returning an error saying that hello.replaceAt is not a function, that hello.replaceAt is undefined.

    var hello = 'Hello World';
    alert(hello.replaceAt(2, "!!"));

Why is this not working? Thanks.

replace is a function replace**At** is not ... (unless you create one or use a library that implements one) — Alex K., May 18 '17 at 11:08
http://stackoverflow.com/questions/1431094/how-do-i-replace-a-character-at-a-particular-index-in-javascript — sumit chauhan, May 18 '17 at 11:09

score 1 · Answer 1 · answered May 18 '17 at 11:10

1

Using replace():

var hello = 'Hello World!!';
    alert(hello.replace("!!",'??'));

If you want to replace all matchs in a string you can use this funct

String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.split(search).join(replacement);
};

Because .replace() just replace first match. Cheers

answered May 18 '17 at 11:10

Roy Bogado

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i would like to replace part of the string at a certain index – Paul May 18 '17 at 11:12

score 0 · Answer 2 · answered May 18 '17 at 11:13

function myFunction() {
    var str = document.getElementById("demo").innerHTML; 
    var res = str.replace("!!", "...!!");
    document.getElementById("demo").innerHTML = res;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<p id="demo">Hello world!!</p>
<button onclick="myFunction()">Try it</button>

Check this out. Help you to get some idea.

Greetings!

.replace is not a function error in javascript

2 Answers2