Diffusion Ant (slabs) Code

ant/examples/spec/strings.js
327d21970a03slabs

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

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

			let str = 'hello world';
			test('indexOf found', str.indexOf('world'), 6);
			test('indexOf first occurrence', str.indexOf('o'), 4);
			test('indexOf not found', str.indexOf('xyz'), -1);
			test('indexOf empty string', str.indexOf(''), 0);

			let js = 'JavaScript';
			test('substring start end', js.substring(0, 4), 'Java');
			test('substring start only', js.substring(4), 'Script');
			test('substring swaps if end < start', js.substring(10, 4), 'Script');

			let fox = 'The quick brown fox';
			test('slice start end', fox.slice(0, 3), 'The');
			test('slice start only', fox.slice(10), 'brown fox');
			test('slice negative start', fox.slice(-3), 'fox');
			test('slice negative end', fox.slice(0, -4), 'The quick brown');

			let csv = 'apple,banana,cherry';
			let parts = csv.split(',');
			test('split length', parts.length, 3);
			test('split first', parts[0], 'apple');
			test('split last', parts[2], 'cherry');

			let chars = 'hello'.split('');
			test('split empty', chars.length, 5);
			test('split empty first', chars[0], 'h');

			test('includes true', 'quick brown fox'.includes('quick'), true);
			test('includes false', 'quick brown fox'.includes('cat'), false);
			test('includes empty', 'hello'.includes(''), true);

			test('startsWith true', 'Hello, World!'.startsWith('Hello'), true);
			test('startsWith false', 'Hello, World!'.startsWith('World'), false);

			test('endsWith true', 'index.html'.endsWith('.html'), true);
			test('endsWith false', 'index.html'.endsWith('.js'), false);

			test('toUpperCase', 'hello'.toUpperCase(), 'HELLO');
			test('toLowerCase', 'HELLO'.toLowerCase(), 'hello');

			test('trim', ' hello '.trim(), 'hello');
			test('trimStart', ' hello'.trimStart(), 'hello');
			test('trimEnd', 'hello '.trimEnd(), 'hello');

			test('padStart', '5'.padStart(3, '0'), '005');
			test('padEnd', '5'.padEnd(3, '0'), '500');

			test('repeat', 'ab'.repeat(3), 'ababab');

			test('charAt', 'hello'.charAt(1), 'e');
			test('charAt default index', 'hello'.charAt(), 'h');
			test('charAt coercion', 'hello'.charAt('1'), 'e');
			test('charCodeAt', 'ABC'.charCodeAt(0), 65);
			test('charCodeAt default index', 'ABC'.charCodeAt(), 65);
			test('charCodeAt coercion', 'ABC'.charCodeAt('1'), 66);
			test('codePointAt ascii', 'ABC'.codePointAt(0), 65);
			test('codePointAt default index', 'ABC'.codePointAt(), 65);
			test('codePointAt coercion', 'ABC'.codePointAt('1'), 66);
			test('codePointAt out of bounds', 'ABC'.codePointAt(10), undefined);
			test('codePointAt utf8 2-byte', 'é'.codePointAt(0), 233);
			test('codePointAt utf8 3-byte', '中'.codePointAt(0), 20013);
			test('codePointAt utf8 4-byte', '😀'.codePointAt(0), 128512);

			test('replace', 'hello world'.replace('world', 'there'), 'hello there');
			test('replaceAll', 'a-b-c'.replaceAll('-', '_'), 'a_b_c');

			testDeep('match', 'test123'.match(/\d+/), ['123']);

			test('at positive', 'hello'.at(1), 'e');
			test('at negative', 'hello'.at(-1), 'o');

			test('length', 'hello'.length, 5);
			test('bracket access', 'hello'[0], 'h');

			test('concat', 'hello'.concat(' ', 'world'), 'hello world');

			test('lastIndexOf', 'hello world world'.lastIndexOf('world'), 12);

			test('String.fromCharCode', String.fromCharCode(65, 66, 67), 'ABC');

			test('empty string length', ''.length, 0);
			test('empty indexOf', ''.indexOf('x'), -1);
			test('empty includes empty', ''.includes(''), true);
			test('empty startsWith empty', ''.startsWith(''), true);

			let template = `Value: ${1 + 2}`;
			test('template literal', template, 'Value: 3');

			let multi = `line1
			line2`;
			test('multiline template', multi.includes('\n'), true);

			summary();

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