fix: Add typings and a test case for equality
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6e4e127518
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e555b89f8f
@ -1,5 +1,10 @@
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import { lev, levW } from "../";
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test("lev(abc, abc) == 0", () => {
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expect(lev("abc", "abc", 3, 3)).toBe(0);
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expect(levW("abc", "abc")).toBe(0);
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});
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test("lev(abc, abd) == 1", () => {
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expect(lev("abc", "abd", 3, 3)).toBe(1);
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expect(levW("abc", "abd")).toBe(1);
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@ -1,4 +1,4 @@
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export function one(a: string, b: string, i: number, j: number) {
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function one(a: string, b: string, i: number, j: number): number {
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if (a[i] === b[j]) {
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return 0;
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}
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@ -10,7 +10,7 @@ export function one(a: string, b: string, i: number, j: number) {
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// @a, b: The strings to compare
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// @i, j: From where to compare (a_i and b_j)
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// @ret : The distance in insertions, deletions and changes
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export function lev(a: string, b: string, i: number, j: number) {
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export function lev(a: string, b: string, i: number, j: number): number {
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if (Math.min(i, j) === 0) {
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return Math.max(i, j);
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} else {
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@ -25,6 +25,6 @@ export function lev(a: string, b: string, i: number, j: number) {
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// Computes the difference between the strings a and b.
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// @a, b: The strings to compare
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// @ret : The distance in insertions, deletions and changes
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export function levW(a: string, b: string) {
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export function levW(a: string, b: string): number {
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return lev(a, b, a.length, b.length);
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}
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