Filtering and conditional logic in No-Code - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Conditional Filtering

Imagine you have a list of numbers from 1 to 10. You want to select only the numbers that are greater than 5. Which description best explains this filtering process?

A Selecting numbers that are less than or equal to 5.

B Selecting numbers that are greater than 5.

C Selecting numbers that are exactly 5.

D Selecting all numbers regardless of their value.

💡 Hint

Think about the condition that decides which numbers to keep.

Filtering means choosing items that meet a condition. Here, the condition is 'greater than 5', so only numbers above 5 are selected.

📋 Factual

intermediate

Identifying Conditional Statements

Which of the following is an example of a conditional statement used for filtering data?

A "Sort the items alphabetically."

B "Show all items in the list."

C "Add all items to the basket."

D "If the item is red, include it in the selection."

💡 Hint

Look for a statement that decides based on a condition.

A conditional statement checks if something is true before taking action. Here, it checks if the item is red to include it.

🚀 Application

advanced

Applying Multiple Conditions

You have a list of fruits with their colors: apple (red), banana (yellow), grape (purple), lemon (yellow). You want to filter fruits that are yellow and start with the letter 'b'. Which fruits will you get?

A Banana

B Apple and Grape

C Banana and Lemon

D Lemon

💡 Hint

Check both color and first letter conditions carefully.

The fruit must be yellow and start with 'b'. Banana is yellow and starts with 'b'. Lemon is yellow but starts with 'l'.

🔍 Analysis

advanced

Analyzing Filtering Outcomes

Consider a list of numbers: [2, 4, 6, 8, 10]. You apply a filter to select numbers that are even and less than 7. What is the resulting list?

A [2, 4, 6, 8, 10]

B [4, 6, 8]

C [2, 4, 6]

D [6, 8, 10]

💡 Hint

Check which numbers are even and also less than 7.

All numbers are even, but only 2, 4, and 6 are less than 7, so they remain after filtering.

❓ Reasoning

expert

Reasoning About Conditional Logic in Decision Making

A store offers a discount only if a customer buys more than 3 items and the total price exceeds $50. If a customer buys 4 items costing $12 each, will they get the discount?

A No, because total price is less than $50.

B Yes, because they bought more than 3 items and total price is $48.

C Yes, because buying 4 items always qualifies for discount.

D No, because the number of items does not matter.

💡 Hint

Calculate total price and check both conditions carefully.

The customer bought 4 items (more than 3), but total price is 4 × $12 = $48, which is less than $50, so no discount.

Practice

1. What is the main purpose of filtering in data processing?

easy

A. To select only the data that meets certain conditions

B. To change all data values to uppercase

C. To add new data entries randomly

D. To delete all data permanently

Solution

1. Step 1: Understand filtering concept

   Filtering means choosing only data that fits a rule or condition.

2. Step 2: Match purpose with options

   Only To select only the data that meets certain conditions describes selecting data based on conditions, which is filtering.

3. Final Answer:

   To select only the data that meets certain conditions -> Option A

4. Quick Check:

   Filtering = selecting data by condition [OK]

Hint: Filtering means picking data that fits rules [OK]

Common Mistakes:

• Confusing filtering with changing data values
• Thinking filtering deletes all data
• Assuming filtering adds random data

2. Which of the following is the correct way to write a simple IF condition in pseudocode?

easy

A. WHILE condition THEN action OTHERWISE other_action

B. WHEN condition DO action OTHERWISE other_action

C. FOR condition THEN action ELSE other_action

D. IF condition THEN action ELSE other_action

Solution

1. Step 1: Recall IF condition syntax

   A simple IF condition uses IF, THEN, and optionally ELSE to decide actions.

2. Step 2: Compare options to standard IF syntax

   Only IF condition THEN action ELSE other_action uses IF, THEN, ELSE correctly; others use wrong keywords.

3. Final Answer:

   IF condition THEN action ELSE other_action -> Option D

4. Quick Check:

   IF-THEN-ELSE syntax = IF condition THEN action ELSE other_action [OK]

Hint: IF-THEN-ELSE is the basic conditional format [OK]

Common Mistakes:

• Using FOR or WHILE instead of IF for conditions
• Mixing keywords like WHEN or OTHERWISE incorrectly
• Omitting THEN or ELSE keywords

3. Given this pseudocode:
FOR each number IN [1, 2, 3, 4, 5]
IF number % 2 == 0 THEN print(number)
What will be printed?

medium

A. 1 3 5

B. 2 4

C. 1 2 3 4 5

D. No output

Solution

1. Step 1: Understand the loop and condition

   The loop goes through numbers 1 to 5. The condition checks if number is even (number % 2 == 0).

2. Step 2: Identify even numbers in the list

   Even numbers are 2 and 4, so only these get printed.

3. Final Answer:

   2 4 -> Option B

4. Quick Check:

   Even numbers printed = 2 4 [OK]

Hint: Print only numbers divisible by 2 [OK]

Common Mistakes:

• Printing all numbers instead of only even
• Confusing even and odd numbers
• Thinking no output occurs

4. Find the error in this pseudocode:
IF score > 50
print('Pass')
ELSE IF score > 40
print('Retake')

medium

A. Missing THEN keyword after IF conditions

B. Incorrect use of ELSE IF instead of ELSEIF

C. Missing ELSE keyword before ELSE IF

D. No error, code is correct

Solution

1. Step 1: Check IF condition syntax

   In pseudocode, IF conditions usually require THEN after the condition to separate it from actions.

2. Step 2: Identify missing THEN keywords

   Both IF and ELSE IF lines lack THEN, which is needed for clarity and correctness.

3. Final Answer:

   Missing THEN keyword after IF conditions -> Option A

4. Quick Check:

   IF conditions need THEN keyword [OK]

Hint: IF conditions need THEN before actions [OK]

Common Mistakes:

• Assuming ELSE IF is invalid syntax
• Thinking ELSE must always be alone
• Ignoring THEN keyword requirement

5. You have a list of products with prices: [{"name": "Pen", "price": 5}, {"name": "Book", "price": 15}, {"name": "Bag", "price": 25}].
Using filtering and conditional logic, which pseudocode correctly selects products priced above 10 and prints their names?

hard

A. FOR each product IN productsIF product.price == 10 THEN print(product.name)

B. FOR each product IN productsIF product.price < 10 THEN print(product.name)

C. FOR each product IN productsIF product.price > 10 THEN print(product.name)

D. FOR each product IN productsprint(product.name) IF product.price > 10

Solution

1. Step 1: Understand the filtering condition

   We want products with price greater than 10 only.

2. Step 2: Check each option's condition

   FOR each product IN products
   IF product.price > 10 THEN print(product.name) correctly uses IF product.price > 10 to filter and print names. Others use wrong conditions or syntax.

3. Final Answer:

   FOR each product IN products
   IF product.price > 10 THEN print(product.name) -> Option C

4. Quick Check:

   Filter price > 10 and print names = FOR each product IN products
   IF product.price > 10 THEN print(product.name) [OK]

Hint: Use IF price > 10 to filter products [OK]

Common Mistakes:

• Using wrong comparison operators (< or ==)
• Printing all products without filtering
• Incorrect syntax like placing IF after print