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Lesson 9: Walk the distanceTo

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Challenge focus: 41 - 45

Coding Concepts: Returning value from functions and methods

Coding Adventure Part I

Key stage II

Class IV

Lesson Overview

Coding Adventure Part I

Key stage II

Class IV

Lesson Objectives

• Understand that functions can perform tasks and provide results, known as return values.
• Learn how variables are utilized to store and manage values returned by functions.
• Learn the syntax of assigning a variable to store the result of a function.
• To supply values to functions using variable.
• To supply returned values directly to function.
• Complete challenges 41 - 45.

Coding Adventure Part I

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Class IV

Returned values from a function

• Functions often yield values upon completion of their tasks.
• Typically, these returned values are captured in a variable for subsequent use in the code.

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Coding Adventure Part I

Key stage II

Class IV

Passing down values using variable

Working of the code:

• Step 1: turtle.distanceTo bush This code will execute and return distance of turtle from the bush.
• Step 2: The returned distance from the turtle.distanceTo bush code will be assigned to d.
• Step 3: The value inside variable d will be passed to turtle.step.
• Step 4: turtle.step d will get executed.

Coding Adventure Part I

Key stage II

Class IV

Passing down values without using variable

turtle.step turtle.distanceTo bush

Working of the code:

Step 1: turtle.distanceTo bush This code will execute and return distance of turtle from the bush.

Step 2: The returned distance from the turtle.distanceTo bush supplied to turtle.step

Coding Adventure Part I

Key stage II

Class IV

Demo 1

Using challenge 41, demonstrate the use of returned values to solve the problem in 5 lines.

1. Pass an appropriate variable to a method.
2. Add a line of code that calls a function of turtle, which accepts values from another function.

Coding Adventure Part I

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Class IV

Demo 1 Solution:

Coding Adventure Part I

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Activity 1: Debugging

Complete the code for challenge 42 so that monkey can reach banana on the other side of the river

• Explain the given code.�step distanceTo banana
• Write an algorithm to solve the problem.
• Use the above algorithm and write a code to collect the banana.

Coding Adventure Part I

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Class IV

Activity 1 Solution

i) Breaking down code

Step 1: distanceTo function returns the distance from the monkey to the banana.

Step 2: This returned value is given to step function

ii) Algorithm to solve the problem

Step 1: Start

Step 2: Turn monkey to banana

Step 3: Calculate the distance between banana and monkey

Step 3: Walk monkey to banana

Step 4: Stop

Coding Adventure Part I

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Activity 1 Solution

iii)

Coding Adventure Part I

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Activity 2

• Log into your CodeMonkey account.
• Open Coding Adventure Part 1
• Complete challenges 43 to 45. Challenge 41 & 42 have already been demonstrated to you earlier.

Coding Adventure Part I

Key stage II

Class IV

Activity 2 Solution

Coding Adventure Part I

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Class IV

Activity 2 Solution

Coding Adventure Part I

Key stage II

Class IV

Activity 2 Solution

Coding Adventure Part I

Key stage II

Class IV

Key Points

• Functions in programming can execute tasks and produce results, which are known as return values.
• Variables play a crucial role in storing and managing the values returned by functions.
• Learn the syntax of assigning a variable to capture and store the result of a function.
• Passing values to functions using variables, enhancing flexibility.
• Directly passing returned values from one function as inputs to another function.

Coding Adventure Part I

Key stage II

Class IV