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es.array.to-reversed.js
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es.array.to-reversed.js
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import { STRICT } from '../helpers/constants.js';
import Symbol from 'core-js-pure/es/symbol';
import toReversed from 'core-js-pure/es/array/to-reversed';
QUnit.test('Array#toReversed', assert => {
assert.isFunction(toReversed);
let array = [1, 2];
assert.notSame(toReversed(array), array, 'immutable');
assert.deepEqual(toReversed([1, 2.2, 3.3]), [3.3, 2.2, 1], 'basic');
const object = {};
array = {
0: undefined,
1: 2,
2: 1,
3: 'X',
4: -1,
5: 'a',
6: true,
7: object,
8: NaN,
10: Infinity,
length: 11,
};
const expected = [
Infinity,
undefined,
NaN,
object,
true,
'a',
-1,
'X',
1,
2,
undefined,
];
assert.deepEqual(toReversed(array), expected, 'non-array target');
array = [1];
// eslint-disable-next-line object-shorthand -- constructor
array.constructor = { [Symbol.species]: function () {
return { foo: 1 };
} };
assert.true(toReversed(array) instanceof Array, 'non-generic');
if (STRICT) {
assert.throws(() => toReversed(null, () => { /* empty */ }, 1), TypeError);
assert.throws(() => toReversed(undefined, () => { /* empty */ }, 1), TypeError);
}
});