Recap - Username Check

Part of the Logic & Flow section of Coddy's GDScript journey. Lesson 5 of 78.

Challenge

Easy

The program reads a username that a player typed into raw. First clean it: remove the spaces at both ends and convert it to lowercase. The cleaned username is valid when all of these rules pass:

It has between 3 and 16 characters, both included
It contains no spaces
It does not begin with a digit (0 to 9)
It contains none of the characters !, ? and .

Print ok: followed by the cleaned username when it is valid, otherwise print bad. For the input Alice42 (with spaces around it), the output is:

ok: alice42

Try it yourself

extends Node

func _ready():
	var raw := OS.read_string_from_stdin()
	# Clean the username, check the rules, print the result

All lessons in Logic & Flow

1Strings In Depth

String Methods Searching in Strings Replace and Trim Split and JoinRecap - Username Check

4Dictionaries Part 2

Nested Dictionaries Arrays of Dictionaries Merging Dictionaries Copying Dictionaries Recap - Frequency Counter

7Enums

What is an Enum?Defining an Enum Enum Values Enums in Match Recap - Traffic Light

10Advanced Functions

Returning Multiple Values Lambda Functions Part 1 Lambda Functions Part 2 Recap - Lambda Sort Recursive Functions Part 1 Recursive Functions Part 2 Recap - Sum Nested Array

13Inventory Management System

Project Overview Add Item

Update Stock

Check Availability

Generate Report

2Advanced Decision Making

Match With Variables Match Guards Array Patterns Dictionary Patterns Membership Checks Recap - Command Parser

5Contact Book Application

Display Menu Add Contact

8Student Records Manager

Project Overview Add Student

11Higher-Order Functions

The map Method The filter Method The reduce Method any and all Recap - Email Validator Recap - Number Processor

14Final Challenges

Smart Contact Manager Word Analytics Data Transformer

3Multi-dimensional Arrays

2D Arrays Basics Accessing 2D Array Elements Nested Loops with 2D Arrays Recap - 2D Arrays Jagged Arrays Common 2D Array Patterns Recap - Game Board

6Sets with Dictionaries

What is a Set?Dictionary as a Set Adding and Removing Union and Intersection Set Difference Recap - Remove Duplicates

9Advanced Data Aggregation

Summing Values Finding Minimum and Maximum Custom Sorting Recap - Dictionary Sorter

12Basic Error Handling

What is Error Handling?Validating Input Guard Clauses Returning Error Codes Recap - Safe Division

Practice on your own: Online GDScript compiler