Javascript Engineer at Focus School Software

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1. 1. Using Javascript or Jquery, how would you select the text "foo" from the following element? <div><div data-field="request">foo</div></div> *

2. How would you access the number 7 from the following object? var data = {foo : 8, bar : 32, baz : 7}; *

3. Write a loop in JavaScript that iterates over the following object and logs each key-value pair in the format "key: value": var user = { name: 'Alice', age: 28, role: 'Tester' }; *

4. Write a statement to loop through the following array and log each number to the browser console. var data = [89, 5, 3, 54, 23]; *

5. What is the difference when you declare a variable with "var" vs. "let"? *

6. How would you merge the following two arrays together so it becomes [1, 3, 8, 44, 99]? var foo = [1, 3, 8]; var bar = [44, 99]; *

7. How would you add the number 9 to the end of the following array? var data = [3, 8, 23, 55, 10]; *

8. Write a javascript and/or JQuery statement that would hide the words “<div class="makeInvisible">this text should be invisible.” Then, change the text “<div class="makeBold">this text should be bold</div>” to bold. *

9. Using JavaScript, write a function that takes a string as input and returns true if it's a palindrome (reads the same forwards and backwards, ignoring case and spaces). For example, "A man a plan a canal Panama" should return true. *

10. How would you handle asynchronous code in JavaScript when making an API call? Provide an example using async/await to fetch data from a URL like 'https://jsonplaceholder.typicode.com/todos/1' and log the title. *

11. Write a JavaScript statement to find and log the maximum value in the following array: var data = [15, 3, 27, 8, 42]; *

12. Explain the difference between '==' and '===' in JavaScript, and give an example where using one over the other would change the outcome. *

13. Using JavaScript, create a simple function that filters an array of numbers to return only the even ones. For example, given [1, 2, 3, 4, 5, 6], it should return [2, 4, 6]. *

14. How would you use JavaScript to add an event listener to a button with id="submit" that alerts "Form submitted!" when clicked? Include how to prevent the default form submission behavior. *

15. Using array methods in JavaScript, how would you transform the array [1, 2, 3, 4] into [2, 4, 6, 8] by doubling each element? *

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