match.js
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match.js
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	import { test, summary } from './helpers.js';

	console.log('Ant.match Tests\n');

	test('match is function', typeof Ant.match, 'function');

	test('exact match number', Ant.match(200, {
	200: 'ok',
	404: 'not found',
	}), 'ok');

	test('exact match string', Ant.match('hello', {
	hello: 'world',
	foo: 'bar',
	}), 'world');

	test('no match returns undefined', Ant.match(999, {
	200: 'ok',
	404: 'not found',
	}), undefined);

	test('Symbol.default fallback', Ant.match(999, {
	200: 'ok',
	[Symbol.default]: 'fallback',
	}), 'fallback');

	test('Symbol.default as function', Ant.match(999, {
	200: 'ok',
	[Symbol.default]: v => `unknown ${v}`,
	}), 'unknown 999');

	test('function arm called with value', Ant.match(200, {
	200: v => `got ${v}`,
	}), 'got 200');

	test('guard arm true', Ant.match(503, {
	200: 'ok',
	[503 >= 500]: 'server error',
	}), 'server error');

	test('guard arm false skipped', Ant.match(503, {
	[503 < 400]: 'client error',
	[Symbol.default]: 'fallback',
	}), 'fallback');

	test('exact match takes priority over guard', Ant.match(200, {
	[true]: 'guard',
	200: 'exact',
	}), 'exact');

	test('arrow function form with $', Ant.match(503, $ => ({
	200: 'ok',
	404: 'not found',
	[$ >= 500]: 'server error',
	})), 'server error');

	test('arrow $ guard false', Ant.match(200, $ => ({
	[$ >= 500]: 'server error',
	[Symbol.default]: 'other',
	})), 'other');

	test('compiler sugar with $', Ant.match(404, {
	200: 'ok',
	[$ === 404]: 'not found',
	[Symbol.default]: 'unknown',
	}), 'not found');

	test('compiler sugar $ receives value', Ant.match(42, {
	[$ > 100]: 'big',
	[$ > 0]: 'positive',
	[Symbol.default]: 'other',
	}), 'positive');

	test('plain values not called', Ant.match(1, {
	1: 'one',
	2: 'two',
	}), 'one');

	test('mixed plain and function arms', Ant.match(2, {
	1: 'one',
	2: v => `two-${v}`,
	}), 'two-2');

	test('empty arms returns undefined', Ant.match(1, {}), undefined);

	test('Symbol.default function receives value', Ant.match(42, {
	[Symbol.default]: v => v * 2,
	}), 84);

	summary();

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