https://app.eraser.io/workspace/3gdsQ3KkAON32PoR5Hsb
| Method | Use Case 📌 | Example Problem 🤔 |
|---|---|---|
map() |
When you need to transform each element in an array and create a new array. | Given an array of prices [100, 200, 300], increase each by 10%. |
filter() |
When you need to extract specific elements based on a condition. | From [10, 15, 20, 25], return only even numbers. |
reduce() |
When you need to combine all elements into a single value (sum, product, etc.). | Calculate the sum of [1, 2, 3, 4]. |
forEach() |
When you need to iterate over an array without creating a new one. | Given an array of strings, print each one to the console. |
find() |
When you need to find the first element that satisfies a condition. | Find the first number greater than 10 in [5, 12, 8, 130]. |
some() |
When you need to check if at least one element meets a condition. | Check if any number in [3, 5, 8] is greater than 6. |
every() |
When you need to check if all elements satisfy a condition. | Check if all numbers in [2, 4, 6] are even. |
includes() |
When you need to check if a specific value exists in an array. | Check if "banana" exists in ['apple', 'banana', 'mango']. |
sort() |
When you need to sort elements in ascending or descending order. | Sort [4, 2, 8, 1] in ascending order. |
slice() |
When you need to extract a portion of an array without modifying the original. | Extract [2, 3, 4] from [1, 2, 3, 4, 5]. |