I know there are methods to remove characters from the beginning and from the end of a string in Javascript. What I need is trim a string in such a way that only the last 4 characters remain.
For eg:
ELEPHANT -> HANT 1234567 -> 4567 
4 Answers
String.prototype.slice will work
var str = "ELEPHANT"; console.log(str.slice(-4)); //=> HANT For, numbers, you will have to convert to strings first
var str = (1234567).toString(); console.log(str.slice(-4)); //=> 4567 FYI .slice returns a new string, so if you want to update the value of str, you would have to
str = str.slice(-4); 
2 Comments
Shah Abaz Khan
just tried it and it works. @Nikhil Actually i just need to display the last 4. Not required to change the actual string.
maček
I added a note either way :)
Use substr method of javascript:
var str="Elephant"; var n=str.substr(-4); alert(n); 
Comments
You can use slice to do this
string.slice(start,end) 
3 Comments
Scary Wombat
down-vote as slice with negative number is better
Ja͢ck
@user2310289 This answer didn't make any assumptions about what
start would be ... it could be negative.Scary Wombat
Maybe an example can be given to show how this would be used
lets assume you use jQuery + javascript as well.
Lets have a label in the HTML page with id="lblTest".
<script type="text/javascript"> function myFunc() { val lblTest = $("[id*=lblTest]"); if (lblTest) { var str = lblTest.text(); // this is your needed functionality alert(str.substring(str.length-4, str.length)); } else { alert('does not exist'); } } </script> Edit: so the core part is -
var str = "myString"; var output = str.substring(str.length-4, str.length); 
2 Comments
Vladimír Hála
What was the reason for down-vote? I'd like to understand...
Scary Wombat
it wasn't me, but what happens if str is < 4 chars in length?
'elephant'.substr(-4)?