Welcome to Day 4 of the 30 Days of LeetCode JavaScript Challenge! Today, we will be tackling the problem of applying a transform over each element in an array. This is a common problem in programming, and being able to solve it efficiently is a valuable skill.
Problem Statement:
Given an array of numbers, we need to apply a transformation function over each element in the array and return a new array with the transformed values.
For example, given the input array [1, 2, 3] and the transformation function f(x) = x * 2, the output array should be [2, 4, 6].
To solve this problem, we can use the Array.map() method in JavaScript. The map() method creates a new array with the results of calling a provided function on every element in the array.
Here’s a step-by-step guide on how to solve this problem:
Step 1: Define the transformation function
First, we need to define the transformation function that we want to apply over each element in the array. This function can be any function that takes a single argument (the element in the array) and returns a transformed value. For example, we can define a simple transformation function that doubles the input value:
const transform = (x) => {
return x * 2;
};Step 2: Define the input array
Next, we need to define the input array that we want to transform. This can be any array of numbers. For example:
const inputArray = [1, 2, 3];Step 3: Apply the transformation over each element
Now, we can use the map() method to apply the transformation function over each element in the input array. The map() method takes a function as an argument, and this function is applied to each element in the array. The result is a new array with the transformed values.
const outputArray = inputArray.map(transform);Step 4: Display the output array
Finally, we can display the output array to see the transformed values. For example:
console.log(outputArray); // Output: [2, 4, 6]That’s it! You have successfully applied a transformation over each element in an array using the map() method in JavaScript. Remember that you can define any transformation function you want and apply it to any array of numbers.
This problem is a great exercise in functional programming and can help you improve your skills in working with arrays and higher-order functions in JavaScript. I hope this tutorial was helpful, and I encourage you to practice more LeetCode problems to sharpen your programming skills. Stay tuned for Day 5 of the 30 Days of LeetCode JavaScript Challenge!
