Diffusion Ant (feature/nursery) Code

ant/examples/spec/switch.js
ddfe6237cab5feature/nursery

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

			console.log('Switch Tests\n');

			let x = 2;
			let result = 0;
			switch (x) {
			case 1: result = 10; break;
			case 2: result = 20; break;
			case 3: result = 30; break;
			default: result = 99;
			}
			test('switch case 2', result, 20);

			let y = 1;
			let sum = 0;
			switch (y) {
			case 1: sum += 1;
			case 2: sum += 2;
			case 3: sum += 3; break;
			default: sum += 100;
			}
			test('switch fall-through', sum, 6);

			let fruit = 'apple';
			let color = '';
			switch (fruit) {
			case 'apple': color = 'red'; break;
			case 'banana': color = 'yellow'; break;
			case 'grape': color = 'purple'; break;
			default: color = 'unknown';
			}
			test('switch string', color, 'red');

			let z = 5;
			let msg = '';
			switch (z) {
			case 1: msg = 'one'; break;
			case 2: msg = 'two'; break;
			default: msg = 'other';
			}
			test('switch default', msg, 'other');

			let a = 0;
			let aResult = '';
			switch (a) {
			case 0: aResult = 'zero'; break;
			case 1: aResult = 'one'; break;
			}
			test('switch case 0', aResult, 'zero');

			let b = true;
			let bResult = '';
			switch (b) {
			case true: bResult = 'true'; break;
			case false: bResult = 'false'; break;
			}
			test('switch boolean', bResult, 'true');

			function getGrade(score) {
			switch (true) {
			case score >= 90: return 'A';
			case score >= 80: return 'B';
			case score >= 70: return 'C';
			default: return 'F';
			}
			}
			test('switch expression A', getGrade(95), 'A');
			test('switch expression B', getGrade(85), 'B');
			test('switch expression F', getGrade(50), 'F');

			summary();

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