generic Sentance compare ( a cool hardcoded pseudo-ai language thing maybe )

sentance_compare.js

self.compareWordSamePer100 = function compareWordSamePer100(s, s2)
{ //at least ##% of words must be the same for it to be considered the same
        var re=/\s\s/g, haz={}, wut=[], i=0, L=s.length-3, cs;
        s=s.toLowerCase().replace(re," ").replace(re," ");
        s2=s2.toLowerCase().replace(re," ").replace(re," ");
        while(i!=L){
            cs="_"+s.substr(i,4);
            if( ! (cs in haz) ){ haz[cs] = 1; wut.push(cs); }
            else haz[cs] |= 1;
            i++;
        };
        i=0; L=s2.length-3;
        while(i!=L){
            cs="_"+s2.substr(i,4);
            if( ! (cs in haz) ){ haz[cs] = 2; wut.push(cs); }
            else haz[cs] |= 2;
            i++;
        };
        i=0; L=wut.length; cs=0;
        while(i!=L){
            if(haz[wut[i]]==3) cs++;
            i++;
        };
        return cs/L; // return sameness in percent decimal format 1 == 100, 0.5 = 50% etc;
}; // is this a cool function? does it help explain the workings of a single ai neuron in a language model, or is it nowhere close to how it actually works?