es.array.last-index-of.js

import { STRICT } from '../helpers/constants.js';

import lastIndexOf from 'core-js-pure/es/array/last-index-of';

QUnit.test('Array#lastIndexOf', assert => {
  assert.isFunction(lastIndexOf);
  assert.same(2, lastIndexOf([1, 1, 1], 1));
  assert.same(-1, lastIndexOf([1, 2, 3], 3, 1));
  assert.same(1, lastIndexOf([1, 2, 3], 2, 1));
  assert.same(-1, lastIndexOf([1, 2, 3], 2, -3));
  assert.same(-1, lastIndexOf([1, 2, 3], 1, -4));
  assert.same(1, lastIndexOf([1, 2, 3], 2, -2));
  assert.same(-1, lastIndexOf([NaN], NaN));
  assert.same(1, lastIndexOf([1, 2, 3].concat(Array(2)), 2));
  assert.same(0, lastIndexOf([1], 1, -0), "shouldn't return negative zero");
  if (STRICT) {
    assert.throws(() => lastIndexOf(null, 0), TypeError);
    assert.throws(() => lastIndexOf(undefined, 0), TypeError);
  }
});