Iterating Over Strings Part 1

Part of the Fundamentals section of Coddy's GDScript journey. Lesson 71 of 92.

A string is a sequence of characters, so a for loop can go through it like an array. Each character is a string of length 1:

var text := "Hey"
for letter in text:
	print(letter)

H
e
y

Strings have indexes too, starting at 0. text.length() is the number of characters, so range(text.length()) gives every index:

for i in range(text.length()):
	print("position %d: %s" % [i, text[i]])

position 0: H
position 1: e
position 2: y

To compare letters without caring about case, convert them first: to_lower() returns the string in lowercase and to_upper() in uppercase. "PiZZa".to_lower() is "pizza".

Challenge

Easy

The program reads one line of text into text. Print how many times the letter p appears in it, counting both p and P.

For the input Happy people play ping pong, the output is 7.

Try it yourself

extends Node

func _ready():
	var text := OS.read_string_from_stdin()
	# Count p and P in text, then print the count

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Integer Division Modulo Operator Arithmetic Shortcuts Recap - Simple Math Comparison Operators

7Basic IO

Output Output With Variables String Formatting Input Cast Recap - Till 120 Recap - True or False

10Functions

Declare a Function Arguments Return Return Types Recap - Sigma Function Recap - Validation Function Default Values

13Iterating Over Arrays

Iterating Over Elements Iterating With IndexesIterating Over Strings Part 1Iterating Over Strings Part 2

16Daily Expense Tracker

Project Overview Exit The Program

2Variables Part 1

Numbers String Boolean Empty Variables Naming Conventions

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Ternary Operator

8Bill Split Calculator

Welcome Message Getting Input

Calculating The Tip And Total

Splitting The Bill

Formatted Output

11FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

14Arrays Advanced

Array Slicing Sequence Operators Membership Sort And Reverse

17Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy

Practice on your own: Online GDScript compiler