Floor and Ceil in Sorted Array in DSA Javascript - Build from Scratch

Floor and Ceil in Sorted Array

📖 Scenario: You are working on a search feature for an online bookstore. When a user searches for a price, you want to find the closest book prices available in the store that are just below or equal to the searched price (floor), and just above or equal to the searched price (ceil).

🎯 Goal: Build a program that finds the floor and ceil values for a given target price in a sorted array of book prices.

📋 What You'll Learn

Create a sorted array of book prices

Create a target price variable

Write logic to find floor and ceil values for the target price

Print the floor and ceil values

💡 Why This Matters

🌍 Real World

Finding floor and ceil values is useful in pricing, searching, and recommendation systems where you want to find closest matches to a target value.

💼 Career

Understanding floor and ceil concepts helps in roles like software development, data analysis, and algorithm design where efficient searching and data handling are required.

1

Create a sorted array of book prices

Create a sorted array called bookPrices with these exact values: [10, 20, 30, 40, 50, 60, 70]

DSA Javascript

// Create the sorted array bookPrices with the given values
// Your code here

Hint

Use const to create the array and include all values in ascending order.

2

Create a target price variable

Create a variable called targetPrice and set it to 35

DSA Javascript

const bookPrices = [10, 20, 30, 40, 50, 60, 70];
// Create the targetPrice variable with value 35
// Your code here

Hint

Use const to create the variable and assign the value 35.

3

Find floor and ceil values for the target price

Write a function called findFloorAndCeil that takes arr and target as parameters and returns an object with floor and ceil properties. Use a for loop with variable i to iterate over arr. Inside the loop, update floor to the largest value less than or equal to target, and ceil to the smallest value greater than or equal to target. Initialize floor to null and ceil to null before the loop.

DSA Javascript

const bookPrices = [10, 20, 30, 40, 50, 60, 70];
const targetPrice = 35;

// Write the findFloorAndCeil function below
// Your code here

Hint

Use a loop to check each value. Update floor if the value is less than or equal to target. Update ceil if the value is greater than or equal to target and less than current ceil.

4

Print the floor and ceil values

Call the findFloorAndCeil function with bookPrices and targetPrice, store the result in result, then print Floor: followed by result.floor and Ceil: followed by result.ceil using two separate console.log statements.

DSA Javascript

const bookPrices = [10, 20, 30, 40, 50, 60, 70];
const targetPrice = 35;

function findFloorAndCeil(arr, target) {
    let floor = null;
    let ceil = null;
    for (let i = 0; i = target && (ceil === null || arr[i] < ceil)) {
            ceil = arr[i];
        }
    }
    return { floor, ceil };
}

// Call the function and print the floor and ceil values
// Your code here

Hint

Store the returned object in a variable and use console.log to print floor and ceil values on separate lines.