i'm having a string let say "Hello world"
And i need to replace the char at ex:3
by specifying index hw can we replace a char.
[JS]
var str = "hello world";
i need something like
str.replceAt(0,"h");
views:
2048answers:
4
A:
You can't. Take the characters before and after the position and concat into a new string:
var s = "Hello world";
var index = 3;
s = s.substr(0, index) + 'x' + s.substr(index + 1);
Guffa
2009-09-16 05:27:46
Actually, yes, you can, but it would be an overkill. You could set up a regular expression to skip the first index - 1 characters and match the character at the index. You can use String.replace with that regular expression to do a direct, in-place replacement. But it's an overkill. So, in practice you can't. But in theory, you can.
Ates Goral
2009-09-16 05:42:06
@Ates: The replace function doesn't do an in-place replacement, it creates a new string and returns it.
Guffa
2009-09-16 05:55:31
+2
A:
There is no replaceAt function in JavaScript. You can use the following code to replace any character in any string at specified position.
function Rep()
{
var str = 'Hello World';
str = setCharAt(str,4,'a');
alert(str);
}
function setCharAt(str,index,chr) {
if(index > str.length-1) return str;
return str.substr(0,index) + chr + str.substr(index+1);
}
<button onclick="Rep();">click</button>
rahul
2009-09-16 05:28:00
+7
A:
Use this at somewhere before
String.prototype.replaceAt=function(index, char) {
return this.substr(0, index) + char + this.substr(index+char.length);
}
and use as following
var hello="Hello World";
alert(hello.replaceAt(3, "a"));
Cem Kalyoncu
2009-09-16 05:29:21
Note that it's generally not a good idea to extend base JavaScript classes. Use a plain utility function instead.
Ates Goral
2009-09-16 05:40:09
A:
In Javascript strings are immutable so you ahve to do something like
var x = "Hello world"
var x = x.substring(0, i) + 'h' + x.substring(i+1);
To replace the character in x at i with 'h'
DevDevDev
2009-09-16 05:32:51