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