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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| import { describe, expect, test } from "vitest"; | ||
| import { compareAsc, compareDesc } from "../compare"; | ||
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| describe("compare functions", () => { | ||
| test("sort strings ascending", () => { | ||
| expect(["b", null, "A", "c", "b"].sort(compareAsc)).toStrictEqual(["A", "b", "b", "c", null]); | ||
| }); | ||
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||
| test("sort strings descending", () => { | ||
| expect(["b", null, null, "A", "c"].sort(compareDesc)).toStrictEqual(["c", "b", "A", null, null]); | ||
| }); | ||
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| test("sort numbers ascending", () => { | ||
| expect([2, null, 1, 3].sort(compareAsc)).toStrictEqual([1, 2, 3, null]); | ||
| }); | ||
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| test("sort numbers descending", () => { | ||
| expect([null, 2, 1, 1, 3].sort(compareDesc)).toStrictEqual([3, 2, 1, 1, null]); | ||
| }); | ||
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| test("sort boolean ascending", () => { | ||
| expect([true, null, true, false].sort(compareAsc)).toStrictEqual([true, true, false, null]); | ||
| }); | ||
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| test("sort boolean descending", () => { | ||
| expect([true, null, false].sort(compareDesc)).toStrictEqual([false, true, null]); | ||
| }); | ||
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| test("sort array ascending", () => { | ||
| const array0 = [3, 2, 4]; | ||
| const array1 = [2, null, 1, 3]; | ||
| const array2: string[] = []; | ||
| const array3: string[] = []; | ||
| const array4 = [null, 4, 5, 6]; | ||
| const array5 = [null]; | ||
| expect([array0, array1, array2, array3, array4, array5].sort(compareAsc)).toStrictEqual([ | ||
| array1, | ||
| array0, | ||
| array4, | ||
| array5, | ||
| array2, | ||
| array3, | ||
| ]); | ||
| }); | ||
|
|
||
| test("sort array descending", () => { | ||
| const array0 = [3, 2, 4]; | ||
| const array1 = [2, null, 1, 3]; | ||
| const array2: string[] = []; | ||
| const array3: string[] = []; | ||
| const array4 = [null, 4, 5, 6]; | ||
| const array5 = [null]; | ||
| expect([array0, array1, array2, array3, array4, array5].sort(compareDesc)).toStrictEqual([ | ||
| array4, | ||
| array0, | ||
| array1, | ||
| array5, | ||
| array2, | ||
| array3, | ||
| ]); | ||
| }); | ||
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| test("sort arrays throws an error", () => { | ||
| expect(() => [[{ x: 0, y: 1 }], [{ x: 1, y: 2 }]].sort(compareAsc)).toThrowError( | ||
| "can't compare values of type 'object'." | ||
| ); | ||
| }); | ||
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| test("sort object throws an error", () => { | ||
| expect(() => | ||
| [ | ||
| { x: 0, y: 1 }, | ||
| { x: 1, y: 2 }, | ||
| ].sort(compareAsc) | ||
| ).toThrowError("can't compare values of type 'object'."); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| class CompareTypeError extends Error { | ||
| constructor(value: unknown) { | ||
| super(`can't compare values of type '${typeof value}'.`); | ||
| this.name = "CompareTypeError"; | ||
| } | ||
| } | ||
|
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| export function compareDesc(a: unknown, b: unknown) { | ||
| if (a === null) { | ||
| return b === null ? 0 : 1; | ||
| } else if (b === null) { | ||
| return -1; | ||
| } else if (Array.isArray(a) && Array.isArray(b)) { | ||
| return compareDescArray(a, b); | ||
| } else { | ||
| return compareAscNonNullPrimitives(b, a); | ||
| } | ||
| } | ||
|
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| export function compareAsc(a: unknown, b: unknown): number { | ||
| if (a === null) { | ||
| return b === null ? 0 : 1; | ||
| } else if (b === null) { | ||
| return -1; | ||
| } else if (Array.isArray(a) && Array.isArray(b)) { | ||
| return compareAscArray(a, b); | ||
| } else { | ||
| return compareAscNonNullPrimitives(a, b); | ||
| } | ||
| } | ||
|
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| function compareAscNonNullPrimitives(a: unknown, b: unknown): number { | ||
| if (typeof a === "number" && typeof b === "number") { | ||
| return compareAscNumber(a, b); | ||
| } else if (typeof a === "string" && typeof b === "string") { | ||
| return compareAscString(a, b); | ||
| } else if (typeof a === "boolean" && typeof b === "boolean") { | ||
| return compareAscBoolean(a, b); | ||
| } else { | ||
| throw new CompareTypeError(a); | ||
| } | ||
| } | ||
|
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| function compareAscNumber(a: number, b: number): number { | ||
| return a - b; | ||
| } | ||
|
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| function compareAscString(a: string, b: string): number { | ||
| return a.toUpperCase().localeCompare(b.toUpperCase()); | ||
| } | ||
|
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| function compareAscBoolean(a: boolean, b: boolean): number { | ||
| if (a === b) { | ||
| return 0; | ||
| } else { | ||
| return a ? -1 : 1; | ||
| } | ||
| } | ||
|
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| function checkArrays(arrays: unknown[][]) { | ||
| for (const array of arrays) { | ||
| const firstA = array.find((value) => value !== null); | ||
| if (firstA !== undefined && typeof firstA !== "number" && typeof firstA !== "string") | ||
| throw new CompareTypeError(firstA); | ||
| } | ||
| } | ||
|
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| function compareAscArray(a: unknown[], b: unknown[]): number { | ||
| if (a.length === 0) { | ||
| return b.length === 0 ? 0 : 1; | ||
| } else if (b.length === 0) { | ||
| return -1; | ||
| } else { | ||
| checkArrays([a, b]); | ||
|
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| // sort on first array item | ||
| const sortedA = a.slice().sort(compareAsc); | ||
| const sortedB = b.slice().sort(compareAsc); | ||
| return compareAsc(sortedA[0], sortedB[0]); | ||
| } | ||
| } | ||
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| function compareDescArray(a: unknown[], b: unknown[]): number { | ||
| if (a.length === 0) { | ||
| return b.length === 0 ? 0 : 1; | ||
| } else if (b.length === 0) { | ||
| return -1; | ||
| } else { | ||
| checkArrays([a, b]); | ||
|
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| // sort on first array item | ||
| const sortedA = a.slice().sort(compareDesc); | ||
| const sortedB = b.slice().sort(compareDesc); | ||
| return compareDesc(sortedA[0], sortedB[0]); | ||
| } | ||
| } |