Javascript has two string methods (`substr` and `substring`) that appear to be identical at first glance; they both return a substring from a given string. So what's the difference? Their second parameters, while both numbers, are expecting two different things.
When using `substring` the second parameter is the first index not to include:
var s = "string";
s.substring(1, 3); // would return 'tr'
var s = "another example";
s.substring(3, 7); // would return 'ther'
When using `substr` the second parameter is the number of characters to include in the substring:
var s = "string";
s.substr(1, 3); // would return 'tri'
var s = "another example";
s.substr(3, 7); // would return 'ther ex'
For more information on string functions, checkout [Quirksmode's guide](http://www.quirksmode.org/js/strings.html).
2009-06-03T23:03:31+10:00
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2008-05-24T18:00:00+10:00
Javascript: Difference between substr and substring
2009-06-03T23:03:31+10:00
javascript-difference-between-substr-and-substring