Count Words with Given Prefix in DSA Javascript - Build from Scratch

Count Words with Given Prefix

📖 Scenario: You are working on a simple text analysis tool. You want to find out how many words in a list start with a certain prefix. This can help in searching or filtering words quickly.

🎯 Goal: Build a small program that counts how many words in a given list start with a specific prefix.

📋 What You'll Learn

Create an array of words with exact values

Create a variable to hold the prefix string

Use a loop to count how many words start with the prefix

Print the count as the final output

💡 Why This Matters

🌍 Real World

Counting words with a prefix is useful in search engines, autocomplete features, and filtering lists quickly.

💼 Career

This skill helps in text processing tasks common in software development, data analysis, and building user-friendly search tools.

1

Create the list of words

Create an array called words with these exact strings: "apple", "app", "application", "banana", "apricot"

DSA Javascript

// Your code here

Hint

Use square brackets [] to create an array and put the words inside quotes separated by commas.

2

Set the prefix to search

Create a variable called prefix and set it to the string "app"

DSA Javascript

const words = ["apple", "app", "application", "banana", "apricot"]
// Your code here

Hint

Use const prefix = "app" to create the prefix variable.

3

Count words starting with the prefix

Create a variable called count and set it to 0. Then use a for loop with variable word to go through words. Inside the loop, if word.startsWith(prefix) is true, increase count by 1.

DSA Javascript

const words = ["apple", "app", "application", "banana", "apricot"]
const prefix = "app"
// Your code here

Hint

Use startsWith method to check the prefix and increase count inside the loop.

4

Print the count

Use console.log(count) to print the number of words starting with the prefix.

DSA Javascript

const words = ["apple", "app", "application", "banana", "apricot"]
const prefix = "app"
let count = 0
for (const word of words) {
    if (word.startsWith(prefix)) {
        count++;
    }
}
// Your code here

Hint

Use console.log(count) to show the result.