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javascript for 🐜's, a tiny runtime with big ambitions antjs.org
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JavaScript
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console.log('Spread Tests\n');
const arr1 = [1, 2, 3];const arr2 = [...arr1, 4, 5];testDeep('spread array', arr2, [1, 2, 3, 4, 5]);
const arr3 = [0, ...arr1];testDeep('spread at start', arr3, [0, 1, 2, 3]);
const arr4 = [0, ...arr1, 4];testDeep('spread in middle', arr4, [0, 1, 2, 3, 4]);
const copy = [...arr1];testDeep('array copy', copy, [1, 2, 3]);test('array copy is new ref', copy !== arr1, true);
const merged = [...[1, 2], ...[3, 4]];testDeep('merge arrays', merged, [1, 2, 3, 4]);
const obj1 = { a: 1, b: 2 };const obj2 = { ...obj1, c: 3 };test('spread object a', obj2.a, 1);test('spread object c', obj2.c, 3);
const obj3 = { ...obj1, b: 10 };test('spread override', obj3.b, 10);
const objCopy = { ...obj1 };test('object copy a', objCopy.a, 1);test('object copy is new ref', objCopy !== obj1, true);
const mergedObj = { ...{ x: 1 }, ...{ y: 2 } };test('merge objects x', mergedObj.x, 1);test('merge objects y', mergedObj.y, 2);
function sum(a, b, c) { return a + b + c;}test('spread in call', sum(...[1, 2, 3]), 6);
const chars = [...'hello'];testDeep('spread string', chars, ['h', 'e', 'l', 'l', 'o']);
summary();