Filtering and conditional logic in No-Code - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to describe filtering: "Filtering means selecting items that {{BLANK_1}} a condition."

No-Code

Filtering means selecting items that [1] a condition.

Drag options to blanks, or click blank then click option'

Ameet

Bbreak

Cignore

Davoid

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing items that ignore or avoid the condition.

Filtering means choosing only the items that meet a certain condition, like picking only red apples from a basket.

2fill in blank

medium

Complete the sentence: "A condition in filtering usually uses {{BLANK_1}} to compare values."

No-Code

A condition in filtering usually uses [1] to compare values.

Drag options to blanks, or click blank then click option'

Acolors

Bsizes

Cshapes

Doperators

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing operators with colors or shapes.

Conditions use operators like >, <, == to compare values and decide which items to keep.

3fill in blank

hard

Fix the sentence: "To filter numbers greater than 10, use the condition: number {{BLANK_1}} 10."

No-Code

To filter numbers greater than 10, use the condition: number [1] 10.

Drag options to blanks, or click blank then click option'

A==

B>

C<

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than or equal symbols instead of greater than.

The symbol > means 'greater than', so 'number > 10' selects numbers bigger than 10.

4fill in blank

hard

Fill both blanks to complete the filtering rule: "Select items where {{BLANK_1}} is {{BLANK_2}} 5."

No-Code

Select items where [1] is [2] 5.

Drag options to blanks, or click blank then click option'

Avalue

Bless than

Cgreater than

Dcolor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'color' instead of 'value' or mixing up comparison words.

We select items where the value is less than 5, meaning values smaller than 5.

5fill in blank

hard

Fill all three blanks to complete the filtering statement: "Keep items where {{BLANK_1}} {{BLANK_2}} 10 and {{BLANK_3}} {{BLANK_2}} 20."

No-Code

Keep items where [1] [2] 10 and [3] [2] 20.

Drag options to blanks, or click blank then click option'

Aage

B>

Cscore

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the properties or using the wrong comparison symbol.

This means keep items where age > 10 and score > 20, selecting items with age and score greater than those numbers.

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