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

	console.log('Delete Operator Tests\n');

	const obj = { a: 1, b: 2, c: 3 };

	let result = delete obj.a;
	test('delete existing property returns true', result, true);
	test('property removed after delete', obj.a, undefined);
	test('has property after delete', 'a' in obj, false);
	test('other properties remain', obj.b, 2);

	result = delete obj.nonexistent;
	test('delete non-existent property returns true', result, true);

	const nested = { outer: { inner: 42 } };
	result = delete nested.outer.inner;
	test('delete nested property', result, true);
	test('nested property removed', nested.outer.inner, undefined);
	test('parent still exists', typeof nested.outer, 'object');

	const arr = [1, 2, 3, 4, 5];
	result = delete arr[2];
	test('delete array element returns true', result, true);
	test('array element becomes undefined', arr[2], undefined);
	test('array length unchanged', arr.length, 5);
	test('array has hole', 2 in arr, false);

	const withUndefined = { x: undefined };
	result = delete withUndefined.x;
	test('delete property set to undefined', result, true);
	test('property gone after delete', 'x' in withUndefined, false);

	const computed = { foo: 'bar', baz: 'qux' };
	const key = 'foo';
	result = delete computed[key];
	test('delete with computed key', result, true);
	test('computed key property removed', computed.foo, undefined);

	const proto = { inherited: true };
	const child = Object.create(proto);
	child.own = 'value';
	result = delete child.own;
	test('delete own property', result, true);
	test('own property removed', child.own, undefined);
	test('inherited property still accessible', child.inherited, true);
	result = delete child.inherited;
	test('delete inherited returns true but keeps it', result, true);
	test('inherited still accessible after delete', child.inherited, true);

	const symbolKey = Symbol('test');
	const withSymbol = { [symbolKey]: 'symbol value' };
	result = delete withSymbol[symbolKey];
	test('delete symbol property returns true', result, true);
	test('symbol property removed', withSymbol[symbolKey], undefined);

	summary();

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