Code is not protected for incorrect user input

[gibito]

HTR:

1)use this as format string: [red]-##,# 2) jj=ostr.length-1; will break with length of undefined

[snoopyjc]

I get an error message on this one:

console.log(SSF.format("[red]-##,#", 1))
error: Error: unsupported format |##,#|

If I put the comma in the proper place, then it works as expected:

console.log(SSF.format("[red]-#,###", 1))
-1