Featured update db

Author: fix2015

README.md

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+## [How do you run Protractor tests in headless mode?](#how-to-run-protractor-tests-in-headless-mode)
+
+### How do you run Protractor tests in headless mode?
+
+To run Protractor tests in headless mode, you can configure the `protractor.conf.js` file to use a headless browser like Chrome.
+
+Example configuration:
+
+```javascript
+capabilities: {
+  'browserName': 'chrome',
+  'chromeOptions': {
+    args: ['--headless', '--disable-gpu', '--window-size=800x600']
+  }
+},
+```
+
+**Tags**: [advanced](./level/advanced), [Protractor](./theme/protractor), [Headless Testing](./theme/headless_testing)
+
+

level/advanced/how_do_you_run_protractor_tests_in_headless_mode_.md

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+## [How do you check if a Queue is empty in JavaScript?](#how-to-check-if-a-queue-is-empty)
+
+### How do you check if a Queue is empty in JavaScript?
+
+To check if a queue is empty, you can verify if the queue's length is zero.
+
+Example:
+
+```javascript
+let queue = new Queue();
+console.log(queue.isEmpty());  // true
+```
+
+**Tags**: [basic](./level/basic), [JavaScript](./theme/javascript), [Operations](./theme/operations)
+
+

level/basic/how_do_you_check_if_a_queue_is_empty_in_javascript_.md

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+## [How do you implement a Queue in JavaScript?](#how-to-implement-a-queue-in-javascript)
+
+### How do you implement a Queue in JavaScript?
+
+A queue can be implemented using an array or linked list. For simplicity, let's use an array.
+
+Example of a queue implementation using an array:
+
+```javascript
+class Queue {
+  constructor() {
+    this.items = [];
+  }
+  enqueue(element) {
+    this.items.push(element);
+  }
+  dequeue() {
+    return this.items.shift();
+  }
+  peek() {
+    return this.items[0];
+  }
+  isEmpty() {
+    return this.items.length === 0;
+  }
+}
+```
+
+**Tags**: [basic](./level/basic), [JavaScript](./theme/javascript), [Implementation](./theme/implementation)
+
+

level/basic/how_do_you_implement_a_queue_in_javascript_.md

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+## [How do you implement the dequeue operation in a Queue?](#how-to-implement-dequeue-operation-in-queue)
+
+### How do you implement the dequeue operation in a Queue?
+
+The dequeue operation removes an element from the front of the queue. In JavaScript, you can use the `shift()` method on an array to achieve this.
+
+Example:
+
+```javascript
+let queue = [1, 2, 3];
+let dequeued = queue.shift();
+console.log(dequeued);  // 1
+console.log(queue);     // [2, 3]
+```
+
+**Tags**: [basic](./level/basic), [JavaScript](./theme/javascript), [Operations](./theme/operations)
+
+

level/basic/how_do_you_implement_the_dequeue_operation_in_a_queue_.md

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+## [How do you locate elements in Protractor?](#how-to-locate-elements-in-protractor)
+
+### How do you locate elements in Protractor?
+
+In Protractor, you can locate elements using various locators such as CSS selectors, XPath, and Angular-specific locators.
+- `by.id()`: Locate by ID.
+- `by.css()`: Locate by CSS selectors.
+- `by.xpath()`: Locate by XPath.
+
+Example:
+
+```javascript
+let button = element(by.css('.submit-button'));
+```
+
+**Tags**: [basic](./level/basic), [Protractor](./theme/protractor), [Locators](./theme/locators)
+
+

level/basic/how_do_you_locate_elements_in_protractor_.md

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+## [How do you run Jest tests from the command line?](#how-do-you-run-jest-tests-from-the-command-line)
+
+### How do you run Jest tests from the command line?
+
+You can run Jest tests from the command line using the `jest` command. Make sure Jest is installed, and you can run `npx jest` or `npm test` to run all the tests.
+
+Example:
+
+```bash
+npx jest
+```
+
+**Tags**: [basic](./level/basic), [Jest](./theme/jest), [Command Line](./theme/command_line)
+
+

level/basic/how_do_you_run_jest_tests_from_the_command_line_.md

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+## [How do you set up Protractor for UI Testing?](#how-to-setup-protractor-for-ui-testing)
+
+### How do you set up Protractor for UI Testing?
+
+To set up Protractor, you need to install Node.js, install Protractor via npm, and configure the `protractor.conf.js` file. After the setup, you can use Protractor commands to interact with web pages in your tests.
+
+**Tags**: [basic](./level/basic), [Protractor](./theme/protractor), [Setup](./theme/setup)
+
+

level/basic/how_do_you_set_up_protractor_for_ui_testing_.md

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+## [How do you write a simple Jest test?](#how-to-write-a-simple-jest-test)
+
+### How do you write a simple Jest test?
+
+To write a simple Jest test, use the `test` function, which accepts a description of the test and a callback function that contains the code to test.
+
+Example:
+
+```javascript
+test('adds 1 + 2 to equal 3', () => {
+  expect(1 + 2).toBe(3);
+});
+```
+
+**Tags**: [basic](./level/basic), [Jest](./theme/jest), [Testing](./theme/testing)
+
+

level/basic/how_do_you_write_a_simple_jest_test_.md

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+## [How do you write a simple Protractor test?](#how-to-write-a-simple-protractor-test)
+
+### How do you write a simple Protractor test?
+
+A simple Protractor test can be written by creating a `.spec.js` file that contains test cases using Jasmine or Mocha. You can then use `it()` to define the test case and `expect()` to assert conditions.
+
+Example:
+
+```javascript
+describe('Example test', () => {
+  it('should have a title', () => {
+    browser.get('http://example.com');
+    expect(browser.getTitle()).toEqual('Example Domain');
+  });
+});
+```
+
+**Tags**: [basic](./level/basic), [Protractor](./theme/protractor), [Testing](./theme/testing)
+
+