String.slice() is missing

[espruino-discuss]

Posted at 2014-05-21 by Alex

Hi All,

It seems that String.slice() is missing.

http://www.w3schools.com/jsref/jsref_slice_string.asp

I was wondering if this will be implemented in espruino?

Regards,

Alex

[gfwilliams]

Posted at 2014-05-21 by @gfwilliams

I'll look into it - it looks amazingly similar to String.substring though - it seems a shame to have 3 different ways of getting substrings!

For now, something like:

String.prototype.slice = function(a,b) {
  if (b<0) b+=this.length;
  return this.substring(a,b);
}

will probably do all you need.

[espruino-discuss]

Posted at 2014-05-21 by Alex

Hi Gordon,

Thats true, though slice can also just have one argument. For last element in string you can do string.slice(-1). Which ofcourse you can also do with string.substring(string.lenght-1, string.length). It would be nice to have :)

Regards,

Alex

[gfwilliams]

Posted at 2014-05-21 by @gfwilliams

You can also use "Hello".substr(-1) too.

I think I can put it in and basically re-use the same code - it's just frustrating that JS has 3 functions which all do basically the same thing in subtly different ways :)