Question

To simplify my question, let’s say I have the following script:

var sPath = "/page/script/";
if (sPath.length != sPath.lastIndexOf("/"))
    sPath = sPath + '/';
// do something else

Why it’s not getting into the conditional? Why it’s a diff value?

Answer 1

Because sPath.length is 13, but the last char of this is string (and the lastIndexOf('/')) is the 12th, because Javascript vectors goes from 0 to n.

For example, the string “ABC” has a length of 3, but its positions are 0, 1 and 2.

However, this should work:

var sPath = "/page/script/";
if ((sPath.length-1) != sPath.lastIndexOf("/"))
    sPath = sPath + '/';

JSFiddle Example: http://jsfiddle.net/zGyAa/