Question

How do I implement a String tokenizer and get the last token of a String separated with comma "," using javascript?

The String to be tokenized may get very large, and that it needs to be memory efficient so the browser won’t hang.

Answer 1

You can probably split the string on the separator and then reference the last item in the resulting array:

var tokenstring = "token1,token2,token3,token4",
    arr = tokenstring.split( ',' ),
    lastToken = arr.pop();  // .pop() removes and returns the last item of the array

console.log( lastToken );