How to return all except last 2 characters of a string?

Question

id = '01d0';
document.write('<br/>'+id.substr(0,-2));

How can I take a string like '01d0and get the01` (all except the last two chars)?

In PHP I would use substr(0,-2) but this doesn't seem to work in JavaScript.

How can I make this work?

score 149 · Accepted Answer · answered Jun 10 '11 at 09:32

149

You are looking for slice() (also see MDC)

id.slice(0, -2)

answered Jun 10 '11 at 09:32

Tomalak

4

The `slice()` is right. I'm always surprised by how few people know about it and its useful negative offsets. – Tim Down Jun 10 '11 at 09:53

score 11 · Answer 2 · answered Jun 10 '11 at 09:32

11

Try id.substring(0, id.length - 2);

answered Jun 10 '11 at 09:32

James Allardice

score 2 · Answer 3 · answered Jun 10 '11 at 09:34

2

var str = "031p2";
str.substring(0, str.length-2);

answered Jun 10 '11 at 09:34

Cyril N.

score 2 · Answer 4 · answered Jun 10 '11 at 09:34

2

Something like:

id.substr(0, id.length - 2)

The first parameter of substr is the starting index. The second parameter is how many characters to take.

answered Jun 10 '11 at 09:34

Tom Wadley

4 Answers4