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

Count Words with Given Prefix

📖 Scenario: You are building a simple tool to help a bookstore find how many book titles start with a certain prefix. This helps the store quickly find books related to a topic or author.

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

📋 What You'll Learn

Create a list of words with exact values

Create a string variable for the prefix to search

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

Print the count as the final output

💡 Why This Matters

🌍 Real World

Searching for words or titles starting with a prefix is common in search engines, autocomplete features, and filtering lists.

💼 Career

Understanding how to filter and count items based on conditions is a key skill in programming and data processing jobs.

1

Create the list of words

Create a slice of strings called words with these exact values: "apple", "app", "application", "banana", "apricot"

DSA Go

# Create the slice words with the given values
# Your code here

Hint

Use []string{} to create a slice of strings with the exact words.

2

Create the prefix variable

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

DSA Go

package main

func main() {
    words := []string{"apple", "app", "application", "banana", "apricot"}
    // Create the prefix variable
    // Your code here
}

Hint

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

3

Count words starting with the prefix

Create an integer variable called count and set it to 0. Use a for loop with variable _, word to iterate over words. Inside the loop, use strings.HasPrefix(word, prefix) to check if the word starts with the prefix. If yes, increase count by 1.

DSA Go

package main

import "strings"

func main() {
    words := []string{"apple", "app", "application", "banana", "apricot"}
    prefix := "app"
    // Create count variable and loop to count words starting with prefix
    // Your code here
}

Hint

Use count := 0 before the loop. Use for _, word := range words to loop. Use if strings.HasPrefix(word, prefix) to check prefix.

4

Print the count

Use fmt.Println(count) to print the number of words starting with the prefix.

DSA Go

package main

import "strings"

import "fmt"

func main() {
    words := []string{"apple", "app", "application", "banana", "apricot"}
    prefix := "app"
    count := 0
    for _, word := range words {
        if strings.HasPrefix(word, prefix) {
            count++
        }
    }
    // Print the count
    // Your code here
}

Hint

Use fmt.Println(count) to show the result.