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Implemented default comparers for strings

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Kir_Antipov 2022-12-08 05:58:31 +00:00
parent d1b1ed9a16
commit 89d56de5e4
2 changed files with 68 additions and 0 deletions
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13
src/utils/comparison/string-comparer.ts Normal file
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import { createBaseComparer, createDefaultComparer } from "./comparer";
/**
* A string comparer that performs a case-sensitive ordinal string comparison.
*/
export const ORDINAL_COMPARER = createDefaultComparer<string>();
/**
* A string comparer that ignores case differences.
*/
export const IGNORE_CASE_COMPARER = createBaseComparer<string>().thenBy(
(left, right) => left?.localeCompare(right, undefined, { sensitivity: "accent" }) ?? 0
);

55
tests/unit/utils/comparison/string-comparer.spec.ts Normal file
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import { ORDINAL_COMPARER, IGNORE_CASE_COMPARER } from "@/utils/comparison/string-comparer";
describe("ORDINAL_COMPARER", () => {
test("compares two strings using case-sensitive ordinal comparison", () => {
expect(ORDINAL_COMPARER("test", "test")).toBe(0);
expect(ORDINAL_COMPARER("Test", "test")).toBeLessThan(0);
expect(ORDINAL_COMPARER("test", "Test")).toBeGreaterThan(0);
expect(ORDINAL_COMPARER("test", "testing")).toBeLessThan(0);
expect(ORDINAL_COMPARER("testing", "test")).toBeGreaterThan(0);
});
test("treats undefined as smaller than any other value", () => {
expect(ORDINAL_COMPARER(undefined, "test")).toBeLessThan(0);
expect(ORDINAL_COMPARER(undefined, null)).toBeLessThan(0);
expect(ORDINAL_COMPARER(undefined, undefined)).toBe(0);
});
test("treats null as smaller than any other value except undefined", () => {
expect(ORDINAL_COMPARER(null, "test")).toBeLessThan(0);
expect(ORDINAL_COMPARER(null, undefined)).toBeGreaterThan(0);
expect(ORDINAL_COMPARER(null, null)).toBe(0);
});
});
describe("IGNORE_CASE_COMPARER", () => {
test("compares two strings using case-insensitive ordinal comparison", () => {
expect(IGNORE_CASE_COMPARER("A", "a")).toBe(0);
expect(IGNORE_CASE_COMPARER("a", "B")).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER("A", "b")).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER("A", "B")).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER("B", "a")).toBeGreaterThan(0);
expect(IGNORE_CASE_COMPARER("b", "A")).toBeGreaterThan(0);
expect(IGNORE_CASE_COMPARER("B", "A")).toBeGreaterThan(0);
});
test("ignores case differences when comparing strings", () => {
expect(IGNORE_CASE_COMPARER("test", "test")).toBe(0);
expect(IGNORE_CASE_COMPARER("Test", "test")).toBe(0);
expect(IGNORE_CASE_COMPARER("TEST", "test")).toBe(0);
expect(IGNORE_CASE_COMPARER("test", "TEST")).toBe(0);
expect(IGNORE_CASE_COMPARER("Test", "TEST")).toBe(0);
});
test("treats undefined as smaller than any other value", () => {
expect(IGNORE_CASE_COMPARER(undefined, "test")).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER(undefined, null)).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER(undefined, undefined)).toBe(0);
});
test("treats null as smaller than any other value except undefined", () => {
expect(IGNORE_CASE_COMPARER(null, "test")).toBeLessThan(0);
expect(IGNORE_CASE_COMPARER(null, undefined)).toBeGreaterThan(0);
expect(IGNORE_CASE_COMPARER(null, null)).toBe(0);
});
});