diff - how to use javascript for string words comparision

Question

I am using two text areas. Project is about online typing test. I used two text area. First textarea contains the matter to be typed in second textarea. For calculating the the net typing speed I need a javascript diff algorithm.

Javascript Diff Algorithm algo fits my all requirements..which uses this

jsdiff.js

javascript file for differencing of two strings. and

JS Diff Demo

is a demo which uses the same javascript file...You should have look of this demo. But I how can I know count correct words typed? Trouble is that the javascript file provided is not using any comments nor gives any documentation.

Answer 1

I'm not sure if you need much more explanation than the comment I placed above. I like the diff-highlighting your link shows, but if all you're after is counting the diffs, why does something like this not work? http://jsfiddle.net/vSySu/

var arr1 = $('#text1').val().split(' ');
var arr2 = $('#text2').val().split(' '); // split on whatever string or regex you want.

var diffs = 0;
for (var i = 0; i < arr1.length; i++) {
    if (arr1[i] !== arr2[i]) {
        diffs++;
    }
}

alert(diffs);