64 lines
1.6 KiB
JavaScript
64 lines
1.6 KiB
JavaScript
const {distance, closest} = require("./index.js");
|
|
|
|
const levenshtein = (a, b) => {
|
|
if (a.length === 0) return b.length;
|
|
if (b.length === 0) return a.length;
|
|
|
|
if (a.length > b.length) {
|
|
const tmp = a;
|
|
a = b;
|
|
b = tmp;
|
|
}
|
|
|
|
const row = [];
|
|
for (let i = 0; i <= a.length; i++) {
|
|
row[i] = i;
|
|
}
|
|
|
|
for (let i = 1; i <= b.length; i++) {
|
|
let prev = i;
|
|
for (let j = 1; j <= a.length; j++) {
|
|
let val;
|
|
if (b.charAt(i - 1) === a.charAt(j - 1)) {
|
|
val = row[j - 1];
|
|
} else {
|
|
val = Math.min(row[j - 1] + 1, prev + 1, row[j] + 1);
|
|
}
|
|
row[j - 1] = prev;
|
|
prev = val;
|
|
}
|
|
row[a.length] = prev;
|
|
}
|
|
|
|
return row[a.length];
|
|
};
|
|
|
|
function makeid(length) {
|
|
let result = "";
|
|
const characters =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
|
|
const charactersLength = characters.length;
|
|
for (let i = 0; i < length; i++) {
|
|
result += characters.charAt(Math.floor(Math.random() * charactersLength));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
test("test compare", () => {
|
|
const errors = 0;
|
|
for (let i = 0; i < 1000; i++) {
|
|
const rnd_num1 = (Math.random() * 1000) | 0;
|
|
const rnd_num2 = (Math.random() * 1000) | 0;
|
|
const rnd_string1 = makeid(rnd_num1);
|
|
const rnd_string2 = makeid(rnd_num2);
|
|
const actual = distance(rnd_string1, rnd_string2);
|
|
const expected = levenshtein(rnd_string1, rnd_string2);
|
|
expect(actual).toBe(expected);
|
|
}
|
|
});
|
|
|
|
test("test find", () => {
|
|
const actual = closest("fast", ["slow", "faster", "fastest"]);
|
|
const expected = "faster";
|
|
expect(actual).toBe(expected);
|
|
});
|