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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);
});