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function jw(s1, s2) {
j_sim = jsim(s1, s2);
p = 0.1;
l = 0;
L1 = s1.split('');
L2 = s2.split('');
for (let i = 0; i < 4; i++)
if (L1[i] == L2[i])
l += 1;
w_sim = j_sim + l*p*(1 - j_sim);
return 1 - w_sim;
}
function jsim(s1, s2) {
l1 = s1.length;
l2 = s2.length;
offset = Math.max(l1, l2) / 2;
[m, t] = num_matches(s1, s2, offset);
if (m > 0)
return 1/3 * (m/l1 + m/l2 + (m - t)/m)
else
return 0
}
function num_matches(s1, s2, offset) {
L1 = s1.split('');
L2 = s2.split('');
cnt = 0;
trans = 0;
for (let i = 0; i < s1.length; i++) {
let found_match = false;
for (let j = 0; j < s2.length; j++) {
if (!found_match)
if (Math.abs(i - j) < offset)
if (L1[i] == L2[j]) {
found_match = true;
cnt += 1;
if (i != j)
if (((i + 1 < s1.length) && (L1[i] == L2[i + 1]) && (L2[i] == L1[i + 1])) || ((i - 1 >= 0) && (L1[i] == L2[i - 1]) && (L2[i] == L1[i - 1])))
trans += 1;
}
}
}
return [cnt, trans/2];
}
s1 = "faremviel";
s2 = "farmville";
console.log(jw(s1, s2));
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