MIRROR: javascript for 🐜's, a tiny runtime with big ambitions
add match spec
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examples/spec/match.js
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examples/spec/match.js
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import { test, summary } from './helpers.js';
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console.log('Ant.match Tests\n');
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test('match is function', typeof Ant.match, 'function');
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test('exact match number', Ant.match(200, {
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200: 'ok',
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404: 'not found',
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}), 'ok');
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test('exact match string', Ant.match('hello', {
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hello: 'world',
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foo: 'bar',
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}), 'world');
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test('no match returns undefined', Ant.match(999, {
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200: 'ok',
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404: 'not found',
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}), undefined);
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test('Symbol.default fallback', Ant.match(999, {
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200: 'ok',
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[Symbol.default]: 'fallback',
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}), 'fallback');
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test('Symbol.default as function', Ant.match(999, {
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200: 'ok',
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[Symbol.default]: v => `unknown ${v}`,
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}), 'unknown 999');
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test('function arm called with value', Ant.match(200, {
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200: v => `got ${v}`,
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}), 'got 200');
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test('guard arm true', Ant.match(503, {
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200: 'ok',
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[503 >= 500]: 'server error',
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}), 'server error');
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test('guard arm false skipped', Ant.match(503, {
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[503 < 400]: 'client error',
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[Symbol.default]: 'fallback',
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}), 'fallback');
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test('exact match takes priority over guard', Ant.match(200, {
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[true]: 'guard',
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200: 'exact',
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}), 'exact');
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test('arrow function form with $', Ant.match(503, $ => ({
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200: 'ok',
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404: 'not found',
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[$ >= 500]: 'server error',
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})), 'server error');
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test('arrow $ guard false', Ant.match(200, $ => ({
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[$ >= 500]: 'server error',
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[Symbol.default]: 'other',
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})), 'other');
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test('compiler sugar with $', Ant.match(404, {
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200: 'ok',
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[$ === 404]: 'not found',
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[Symbol.default]: 'unknown',
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}), 'not found');
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test('compiler sugar $ receives value', Ant.match(42, {
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[$ > 100]: 'big',
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[$ > 0]: 'positive',
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[Symbol.default]: 'other',
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}), 'positive');
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test('plain values not called', Ant.match(1, {
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1: 'one',
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2: 'two',
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}), 'one');
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test('mixed plain and function arms', Ant.match(2, {
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1: 'one',
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2: v => `two-${v}`,
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}), 'two-2');
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test('empty arms returns undefined', Ant.match(1, {}), undefined);
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test('Symbol.default function receives value', Ant.match(42, {
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[Symbol.default]: v => v * 2,
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}), 84);
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summary();