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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import { assert, assertEquals } from "../assert/mod.ts";import { BinaryHeap } from "./binary_heap.ts";import { ascend, descend } from "./comparators.ts";import { type Container, MyMath } from "./_test_utils.ts";
Deno.test("BinaryHeap works with default descend comparator", () => { const maxHeap = new BinaryHeap<number>(); const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100]; let actual: number[] = [];
assertEquals(maxHeap.length, 0); assertEquals(maxHeap.isEmpty(), true); assertEquals(maxHeap.peek(), undefined); for (const [i, value] of values.entries()) { assertEquals(maxHeap.push(value), i + 1); } assertEquals(maxHeap.length, values.length); assertEquals(maxHeap.isEmpty(), false); while (!maxHeap.isEmpty()) { assertEquals(maxHeap.peek(), expected[actual.length]); actual.push(maxHeap.pop() as number); assertEquals(maxHeap.length, expected.length - actual.length); assertEquals(maxHeap.isEmpty(), actual.length === expected.length); } assertEquals(maxHeap.peek(), undefined); assertEquals(actual, expected);
actual = []; assertEquals(maxHeap.push(...values), values.length); assertEquals(maxHeap.length, values.length); assertEquals(maxHeap.isEmpty(), false); assertEquals(maxHeap.peek(), expected[0]); for (const value of maxHeap) { actual.push(value); assertEquals(maxHeap.length, expected.length - actual.length); assertEquals(maxHeap.isEmpty(), actual.length === expected.length); assertEquals(maxHeap.peek(), expected[actual.length]); } assertEquals(actual, expected);});
Deno.test("BinaryHeap works with ascend comparator", () => { const minHeap = new BinaryHeap<number>(ascend); const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 9, 9, 10, 100]; let actual: number[] = [];
assertEquals(minHeap.length, 0); assertEquals(minHeap.isEmpty(), true); assertEquals(minHeap.peek(), undefined); for (const [i, value] of values.entries()) { assertEquals(minHeap.push(value), i + 1); } assertEquals(minHeap.length, values.length); assertEquals(minHeap.isEmpty(), false); while (!minHeap.isEmpty()) { assertEquals(minHeap.peek(), expected[actual.length]); actual.push(minHeap.pop() as number); assertEquals(minHeap.length, expected.length - actual.length); assertEquals(minHeap.isEmpty(), actual.length === expected.length); } assertEquals(minHeap.peek(), undefined); assertEquals(actual, expected);
actual = []; assertEquals(minHeap.push(...values), values.length); assertEquals(minHeap.length, values.length); assertEquals(minHeap.isEmpty(), false); assertEquals(minHeap.peek(), expected[0]); for (const value of minHeap) { actual.push(value); assertEquals(minHeap.length, expected.length - actual.length); assertEquals(minHeap.isEmpty(), actual.length === expected.length); assertEquals(minHeap.peek(), expected[actual.length]); } assertEquals(actual, expected);});
Deno.test("BinaryHeap contains objects", () => { const heap = new BinaryHeap(( a: Container, b: Container, ) => ascend(a.id, b.id)); const ids: number[] = [-10, 9, -1, 100, 1, 0, -100, 10, -9];
for (const [i, id] of ids.entries()) { const newContainer: Container = { id, values: [] }; assertEquals(heap.push(newContainer), i + 1); newContainer.values.push(i - 1, i, i + 1); assertEquals(heap.length, i + 1); assertEquals(heap.isEmpty(), false); }
const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 10, 100]; const expectedValue: number[] = [6, 0, 8, 2, 5, 4, 1, 7, 3]; for (const [i, value] of expectedValue.entries()) { assertEquals(heap.length, ids.length - i); assertEquals(heap.isEmpty(), false);
const expectedContainer = { id: expected[i], values: [value - 1, value, value + 1], }; assertEquals(heap.peek(), expectedContainer); assertEquals(heap.pop(), expectedContainer); } assertEquals(heap.length, 0); assertEquals(heap.isEmpty(), true);});
Deno.test("BinaryHeap.from() handles iterable", () => { const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const originalValues: number[] = Array.from(values); const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100]; let heap = BinaryHeap.from(values); assertEquals(values, originalValues); assertEquals([...heap], expected);
heap = BinaryHeap.from(values, { compare: ascend }); assertEquals(values, originalValues); assertEquals([...heap].reverse(), expected);
heap = BinaryHeap.from(values, { map: (v: number) => 2 * v, }); assertEquals([...heap], expected.map((v: number) => 2 * v));
const math = new MyMath(); heap = BinaryHeap.from(values, { map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals(values, originalValues); assertEquals([...heap], expected.map((v: number) => 3 * v));
heap = BinaryHeap.from(values, { compare: ascend, map: (v: number) => 2 * v, }); assertEquals(values, originalValues); assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
heap = BinaryHeap.from(values, { compare: ascend, map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals(values, originalValues); assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("BinaryHeap.from() handles default descend comparator", () => { const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const expected: number[] = [100, 10, 9, 9, 9, 1, 0, -1, -9, -10, -100]; const maxHeap = new BinaryHeap<number>(); maxHeap.push(...values); let heap = BinaryHeap.from(maxHeap); assertEquals([...maxHeap], expected); assertEquals([...heap], expected);
maxHeap.push(...values); heap = BinaryHeap.from(maxHeap, { compare: ascend }); assertEquals([...maxHeap], expected); assertEquals([...heap].reverse(), expected);
maxHeap.push(...values); heap = BinaryHeap.from(maxHeap, { map: (v: number) => 2 * v, }); assertEquals([...maxHeap], expected); assertEquals([...heap], expected.map((v: number) => 2 * v));
const math = new MyMath(); maxHeap.push(...values); heap = BinaryHeap.from(maxHeap, { map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals([...maxHeap], expected); assertEquals([...heap], expected.map((v: number) => 3 * v));
maxHeap.push(...values); heap = BinaryHeap.from(maxHeap, { compare: ascend, map: (v: number) => 2 * v, }); assertEquals([...maxHeap], expected); assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
maxHeap.push(...values); heap = BinaryHeap.from(maxHeap, { compare: ascend, map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals([...maxHeap], expected); assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("BinaryHeap.from() handles ascend comparator", () => { const values: number[] = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const expected: number[] = [-100, -10, -9, -1, 0, 1, 9, 9, 9, 10, 100]; const minHeap = new BinaryHeap<number>(ascend); minHeap.push(...values); let heap = BinaryHeap.from(minHeap); assertEquals([...minHeap], expected); assertEquals([...heap], expected);
minHeap.push(...values); heap = BinaryHeap.from(minHeap, { compare: descend }); assertEquals([...minHeap], expected); assertEquals([...heap].reverse(), expected);
minHeap.push(...values); heap = BinaryHeap.from(minHeap, { map: (v: number) => 2 * v, }); assertEquals([...minHeap], expected); assertEquals([...heap], expected.map((v: number) => 2 * v));
const math = new MyMath(); minHeap.push(...values); heap = BinaryHeap.from(minHeap, { map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals([...minHeap], expected); assertEquals([...heap], expected.map((v: number) => 3 * v));
minHeap.push(...values); heap = BinaryHeap.from(minHeap, { compare: descend, map: (v: number) => 2 * v, }); assertEquals([...minHeap], expected); assertEquals([...heap].reverse(), expected.map((v: number) => 2 * v));
minHeap.push(...values); heap = BinaryHeap.from(minHeap, { compare: descend, map: function (this: MyMath, v: number) { return this.multiply(3, v); }, thisArg: math, }); assertEquals([...minHeap], expected); assertEquals([...heap].reverse(), expected.map((v: number) => 3 * v));});
Deno.test("BinaryHeap handles edge case 1", () => { const minHeap = new BinaryHeap<number>(ascend); minHeap.push(4, 2, 8, 1, 10, 7, 3, 6, 5); assertEquals(minHeap.pop(), 1); minHeap.push(9);
const expected = [2, 3, 4, 5, 6, 7, 8, 9, 10]; assertEquals([...minHeap], expected);});
Deno.test("BinaryHeap handles edge case 2", () => { interface Point { x: number; y: number; } const minHeap = new BinaryHeap<Point>((a, b) => ascend(a.x, b.x)); minHeap.push({ x: 0, y: 1 }, { x: 0, y: 2 }, { x: 0, y: 3 });
const expected = [{ x: 0, y: 1 }, { x: 0, y: 3 }, { x: 0, y: 2 }]; assertEquals([...minHeap], expected);});
Deno.test("BinaryHeap handles edge case 3", () => { interface Point { x: number; y: number; } const minHeap = new BinaryHeap<Point>((a, b) => ascend(a.x, b.x)); minHeap.push( { x: 0, y: 1 }, { x: 1, y: 2 }, { x: 1, y: 3 }, { x: 2, y: 4 }, { x: 2, y: 5 }, { x: 2, y: 6 }, { x: 2, y: 7 }, );
const expected = [ { x: 0, y: 1 }, { x: 1, y: 2 }, { x: 1, y: 3 }, { x: 2, y: 5 }, { x: 2, y: 4 }, { x: 2, y: 6 }, { x: 2, y: 7 }, ]; assertEquals([...minHeap], expected);});
Deno.test("BinaryHeap handles README example", () => { const maxHeap = new BinaryHeap<number>(); maxHeap.push(4, 1, 3, 5, 2); assertEquals(maxHeap.peek(), 5); assertEquals(maxHeap.pop(), 5); assertEquals([...maxHeap], [4, 3, 2, 1]); assertEquals([...maxHeap], []);
const minHeap = new BinaryHeap<number>(ascend); minHeap.push(4, 1, 3, 5, 2); assertEquals(minHeap.peek(), 1); assertEquals(minHeap.pop(), 1); assertEquals([...minHeap], [2, 3, 4, 5]); assertEquals([...minHeap], []);
const words = new BinaryHeap<string>((a, b) => descend(a.length, b.length)); words.push("truck", "car", "helicopter", "tank"); assertEquals(words.peek(), "helicopter"); assertEquals(words.pop(), "helicopter"); assertEquals([...words], ["truck", "tank", "car"]); assertEquals([...words], []);});
Deno.test("BinaryHeap.toArray()", () => { const values = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const maxHeap = new BinaryHeap<number>(); maxHeap.push(...values); assert(maxHeap.toArray().every((value) => values.includes(value)));});
Deno.test("BinaryHeap.clear()", () => { const values = [-10, 9, -1, 100, 9, 1, 0, 9, -100, 10, -9]; const maxHeap = new BinaryHeap<number>(); maxHeap.push(...values); maxHeap.clear(); assertEquals(maxHeap.toArray(), []);});