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strings.js
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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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strings.js (3 KB)

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