Diffusion Ant (type-hints-typescript) Code

ant/examples/spec/arrays.js
899dad6b8a9etype-hints-typescript

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

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

			let arr = [1, 2, 3];
			test('array literal creates array', arr instanceof Array, true);
			test('array index 0', arr[0], 1);
			test('array index 1', arr[1], 2);
			test('array index 2', arr[2], 3);
			test('array length', arr.length, 3);

			let empty = [];
			test('empty array is array', empty instanceof Array, true);
			test('empty array length', empty.length, 0);

			let mixed = [1, 'hello', true, null];
			test('mixed array length', mixed.length, 4);
			test('mixed array string', mixed[1], 'hello');
			test('mixed array bool', mixed[2], true);
			test('mixed array null', mixed[3], null);

			arr[0] = 10;
			test('array assignment', arr[0], 10);

			arr.push(4);
			test('push adds element', arr[arr.length - 1], 4);
			test('push increases length', arr.length, 4);

			arr.push(5, 6);
			test('push multiple', arr.length, 6);

			let popped = arr.pop();
			test('pop returns last', popped, 6);
			test('pop decreases length', arr.length, 5);

			let nested = [
			[1, 2],
			[3, 4]
			];
			test('nested array access', nested[0][0], 1);
			test('nested array access deep', nested[1][1], 4);

			let arr2 = Array(3);
			test('Array(n) creates sparse', arr2.length, 3);

			let arr3 = Array(10, 20, 30);
			test('Array with elements', arr3.length, 3);
			test('Array with elements value', arr3[1], 20);

			test('instanceof Array true', [1, 2] instanceof Array, true);
			test('instanceof Array false for object', {} instanceof Array, false);

			let obj = [1, 2, 3];
			obj['foo'] = 'bar';
			test('array string key', obj.foo, 'bar');

			let sumArr = [1, 2, 3, 4];
			let sum = 0;
			for (let i = 0; i < sumArr.length; i++) sum += sumArr[i];
			test('array iteration sum', sum, 10);

			let a = [1, 2, 3];
			testDeep('concat arrays', a.concat([4, 5]), [1, 2, 3, 4, 5]);
			test('join with comma', a.join(','), '1,2,3');
			test('indexOf found', a.indexOf(2), 1);
			test('indexOf not found', a.indexOf(5), -1);
			test('includes true', a.includes(2), true);
			test('includes false', a.includes(5), false);
			testDeep('slice', a.slice(1, 3), [2, 3]);
			testDeep('reverse', [1, 2, 3].reverse(), [3, 2, 1]);

			let shifted = [1, 2, 3];
			test('shift returns first', shifted.shift(), 1);
			test('shift decreases length', shifted.length, 2);

			let unshifted = [2, 3];
			unshifted.unshift(1);
			test('unshift adds to front', unshifted[0], 1);
			test('unshift increases length', unshifted.length, 3);

			testDeep(
			'map',
			[1, 2, 3].map(x => x * 2),
			[2, 4, 6]
			);
			testDeep(
			'filter',
			[1, 2, 3, 4].filter(x => x % 2 === 0),
			[2, 4]
			);
			test(
			'reduce sum',
			[1, 2, 3].reduce((a, b) => a + b, 0),
			6
			);
			test(
			'find',
			[1, 2, 3].find(x => x > 1),
			2
			);
			test(
			'findIndex',
			[1, 2, 3].findIndex(x => x > 1),
			1
			);
			test(
			'every true',
			[2, 4, 6].every(x => x % 2 === 0),
			true
			);
			test(
			'every false',
			[2, 3, 6].every(x => x % 2 === 0),
			false
			);
			test(
			'some true',
			[1, 2, 3].some(x => x > 2),
			true
			);
			test(
			'some false',
			[1, 2, 3].some(x => x > 5),
			false
			);

			testDeep('Array.from string', Array.from('abc'), ['a', 'b', 'c']);
			testDeep('Array.of', Array.of(1, 2, 3), [1, 2, 3]);
			test('instanceof Array true', [] instanceof Array, true);
			test('instanceof Array false', {} instanceof Array, false);

			testDeep('flat', [1, [2, 3]].flat(), [1, 2, 3]);
			testDeep(
			'flatMap',
			[1, 2].flatMap(x => [x, x * 2]),
			[1, 2, 2, 4]
			);

			let filled = new Array(3).fill(0);
			testDeep('fill', filled, [0, 0, 0]);

			let sorted = [3, 1, 2].sort();
			testDeep('sort default', sorted, [1, 2, 3]);

			let sortedDesc = [1, 2, 3].sort((a, b) => b - a);
			testDeep('sort descending', sortedDesc, [3, 2, 1]);

			let orig = [3, 1, 4, 1, 5];
			testDeep('toSorted returns sorted copy', orig.toSorted(), [1, 1, 3, 4, 5]);
			testDeep('toSorted does not mutate', orig, [3, 1, 4, 1, 5]);
			testDeep(
			'toSorted with compareFn',
			[3, 1, 2].toSorted((a, b) => b - a),
			[3, 2, 1]
			);

			testDeep('toReversed returns reversed copy', [1, 2, 3].toReversed(), [3, 2, 1]);
			let orig2 = [1, 2, 3];
			orig2.toReversed();
			testDeep('toReversed does not mutate', orig2, [1, 2, 3]);

			testDeep('toSpliced removes elements', [1, 2, 3, 4, 5].toSpliced(1, 2), [1, 4, 5]);
			testDeep('toSpliced inserts elements', [1, 2, 3].toSpliced(1, 0, 99), [1, 99, 2, 3]);
			testDeep('toSpliced replaces elements', [1, 2, 3, 4, 5].toSpliced(1, 2, 99), [1, 99, 4, 5]);
			let orig3 = [1, 2, 3];
			orig3.toSpliced(1, 1);
			testDeep('toSpliced does not mutate', orig3, [1, 2, 3]);

			testDeep('with replaces element', [1, 2, 3].with(1, 99), [1, 99, 3]);
			testDeep('with negative index', [1, 2, 3].with(-1, 99), [1, 2, 99]);
			let orig4 = [1, 2, 3];
			orig4.with(0, 99);
			testDeep('with does not mutate', orig4, [1, 2, 3]);

			test(
			'findLast',
			[1, 2, 3, 2, 1].findLast(x => x === 2),
			2
			);
			test(
			'findLast returns last match',
			[1, 2, 3, 4, 5].findLast(x => x > 2),
			5
			);
			test(
			'findLast not found',
			[1, 2, 3].findLast(x => x > 5),
			undefined
			);
			test(
			'findLastIndex',
			[1, 2, 3, 2, 1].findLastIndex(x => x === 2),
			3
			);
			test(
			'findLastIndex not found',
			[1, 2, 3].findLastIndex(x => x > 5),
			-1
			);

			test('at positive', [1, 2, 3].at(1), 2);
			test('at negative', [1, 2, 3].at(-1), 3);
			test('at out of bounds', [1, 2, 3].at(5), undefined);

			let forEachResult = [];
			[1, 2, 3].forEach(x => forEachResult.push(x * 2));
			testDeep('forEach', forEachResult, [2, 4, 6]);

			test(
			'reduceRight',
			[1, 2, 3].reduceRight((acc, x) => acc + x, 0),
			6
			);
			test(
			'reduceRight order',
			['a', 'b', 'c'].reduceRight((acc, x) => acc + x, ''),
			'cba'
			);

			test('lastIndexOf found', [1, 2, 3, 2, 1].lastIndexOf(2), 3);
			test('lastIndexOf not found', [1, 2, 3].lastIndexOf(5), -1);

			testDeep('copyWithin', [1, 2, 3, 4, 5].copyWithin(0, 3), [4, 5, 3, 4, 5]);
			testDeep('copyWithin with end', [1, 2, 3, 4, 5].copyWithin(1, 3, 4), [1, 4, 3, 4, 5]);

			let spliceArr = [1, 2, 3, 4, 5];
			let removed = spliceArr.splice(1, 2);
			testDeep('splice returns removed', removed, [2, 3]);
			testDeep('splice mutates array', spliceArr, [1, 4, 5]);

			let spliceArr2 = [1, 2, 3];
			spliceArr2.splice(1, 0, 99, 100);
			testDeep('splice insert', spliceArr2, [1, 99, 100, 2, 3]);

			let entriesArr = ['a', 'b', 'c'];
			let entriesResult = [];
			for (let [i, v] of entriesArr.entries()) entriesResult.push([i, v]);
			testDeep('entries', entriesResult, [
			[0, 'a'],
			[1, 'b'],
			[2, 'c']
			]);

			let keysResult = [];
			for (let k of ['a', 'b', 'c'].keys()) keysResult.push(k);
			testDeep('keys', keysResult, [0, 1, 2]);

			let valuesResult = [];
			for (let v of ['a', 'b', 'c'].values()) valuesResult.push(v);
			testDeep('values', valuesResult, ['a', 'b', 'c']);

			test('Array.isArray true', Array.isArray([1, 2, 3]), true);
			test('Array.isArray false object', Array.isArray({}), false);
			test('Array.isArray false string', Array.isArray('abc'), false);

			summary();

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