From af1552ee1d0f8da2430dcfa8272ebdbb32b750d1 Mon Sep 17 00:00:00 2001
From: Sajid Ali Khan <sajid.hmdrd@gmail.com>
Date: Sat, 16 Sep 2023 13:13:00 +0530
Subject: [PATCH] Create 25-array-exercise.md

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+# Array Exercise Questions
+
+### Easy:
+
+1. **Question:** Given an array `numbers`, how do you add a new element `5` to the end of the array?
+2. **Question:** How can you check if an array `fruits` contains the value `"apple"`?
+3. **Question:** What method can you use to remove the last element from an array `colors`?
+4. **Question:** How do you find the number of elements in an array `grades`?
+5. **Question:** Given an array `words`, how can you join all its elements into a single string separated by commas?
+6. **Question:**: Given an array fruits, how do you add a new element "banana" to the beginning of the array?
+7. **Question:**: How can you check if an array numbers is empty (contains no elements)?
+8. **Question:**: What method can you use to remove the first element from an array animals?
+9. **Question:**: How do you find the largest number in an array scores?
+10. **Question:**: Given an array names, how can you add multiple names, "Alice" and "Bob", to the end of the array in one step?
+
+### Medium:
+
+11. **Question:** Write a function that takes an array of numbers and returns the sum of all the positive numbers in the array.
+12. **Question:** Given an array `names`, how can you create a new array containing only the names that start with the letter `"A"`?
+13. **Question:** How do you reverse the order of elements in an array `characters`?
+14. **Question:** Write a function that takes an array of strings and returns a new array with the strings sorted in alphabetical order.
+15. **Question:** Given an array `numbers`, how can you find the index of the first occurrence of the number `7`?
+16. **Question:**: Write a function that takes an array of strings and returns the longest string in the array.
+17. **Question:**: Given two arrays, arr1 and arr2, how can you combine them into a single array combinedArray?
+18. **Question:**: How do you remove all duplicate values from an array values?
+19. **Question:**: Write a function that takes an array of objects representing people with name, age, and city properties and returns an array of just the names.
+20. **Question:**: Given an array numbers, how do you find the sum of all even numbers in the array?
+
+### Hard:
+
+21. **Question:** Write a function that takes an array of numbers and returns a new array with only the unique values (no duplicates).
+22. **Question:** How can you implement a custom `map` function that works like the built-in `Array.prototype.map`?
+23. **Question:** Write a function that takes two arrays, `arr1` and `arr2`, and returns a new array containing the elements that appear in both arrays (intersection).
+24. **Question:** Given an array of objects `people`, how can you find the person with the highest age?
+25. **Question:** Write a function that takes an array of numbers and returns the median (middle value) of the numbers.
+26. **Question:** Write a function that takes an array of objects representing books with title, author, and publicationYear properties and returns an array of books published before the year 2000.
+27. **Question:** How can you implement a custom filter function that works like the built-in Array.prototype.filter?
+28. **Question:** Write a function that takes an array of numbers and returns a new array with the numbers squared.
+29. **Question:** Given two sorted arrays, arr1 and arr2, write a function to merge them into a single sorted array.
+30. **Question:** Write a function that takes an array of words and returns an object that counts how many times each word appears in the array.