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objects.js
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objects.js
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import { test, testDeep, summary } from './helpers.js';
console.log('Object Tests\n');
let obj = { a: 1, b: 2, c: 3 };
test('object property access', obj.a, 1);
test('object bracket access', obj['b'], 2);
test('object property count', Object.keys(obj).length, 3);
obj.d = 4;
test('add property', obj.d, 4);
obj.a = 10;
test('modify property', obj.a, 10);
delete obj.d;
test('delete property', obj.d, undefined);
test('in operator true', 'a' in obj, true);
test('in operator false', 'z' in obj, false);
testDeep('Object.keys', Object.keys({ x: 1, y: 2 }), ['x', 'y']);
testDeep('Object.values', Object.values({ x: 1, y: 2 }), [1, 2]);
testDeep('Object.entries', Object.entries({ x: 1 }), [['x', 1]]);
let merged = Object.assign({}, { a: 1 }, { b: 2 });
test('Object.assign a', merged.a, 1);
test('Object.assign b', merged.b, 2);
let nested = { a: { b: { c: 1 } } };
test('nested access', nested.a.b.c, 1);
let computed = { ['key' + 1]: 'value' };
test('computed property', computed.key1, 'value');
let short = 'hello';
let shorthand = { short };
test('shorthand property', shorthand.short, 'hello');
let methodObj = {
value: 42,
getValue() {
return this.value;
}
};
test('method shorthand', methodObj.getValue(), 42);
let source = { a: 1, b: 2 };
let spread = { ...source, c: 3 };
test('spread a', spread.a, 1);
test('spread c', spread.c, 3);
let { a, b } = { a: 1, b: 2, c: 3 };
test('destructuring a', a, 1);
test('destructuring b', b, 2);
let { x: renamed } = { x: 5 };
test('destructuring rename', renamed, 5);
let { y = 10 } = {};
test('destructuring default', y, 10);
test('hasOwnProperty true', ({ a: 1 }).hasOwnProperty('a'), true);
test('hasOwnProperty false', ({ a: 1 }).hasOwnProperty('b'), false);
let frozen = Object.freeze({ a: 1 });
test('Object.isFrozen', Object.isFrozen(frozen), true);
let sealed = Object.seal({ a: 1 });
test('Object.isSealed', Object.isSealed(sealed), true);
let proto = { inherited: true };
let child = Object.create(proto);
test('Object.create inherits', child.inherited, true);
test('Object.getPrototypeOf', Object.getPrototypeOf([]) === Array.prototype, true);
testDeep('Object.fromEntries', Object.fromEntries([['a', 1], ['b', 2]]), { a: 1, b: 2 });
summary();

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objects.js (2 KB)

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