Given a hash scores = { alice: 90, bob: 55, carol: 75, dave: 40 }, how can you use reject to create a new hash excluding all entries with scores below 60?

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Ruby - Enumerable and Collection Processing

Given a hash scores = { alice: 90, bob: 55, carol: 75, dave: 40 }, how can you use reject to create a new hash excluding all entries with scores below 60?

Ascores.reject { |name| name < 60 }

Bscores.reject { |name, score| score < 60 }

Cscores.reject { |score| score < 60 }

Dscores.reject { |name, score| name < 60 }

Step-by-Step Solution

Solution:

Step 1: Understand hash reject block parameters
When rejecting from a hash, the block receives two parameters: key and value.
Step 2: Apply condition on values
We want to reject entries where the score (value) is less than 60, so the block should check score < 60.
Step 3: Verify options
scores.reject { |name, score| score < 60 } correctly uses both key and value parameters and checks the score. The other options either use only one block parameter or check the key instead of the value.
Final Answer:
scores.reject { |name, score| score < 60 } -> Option B
Quick Check:
Reject hash entries by value condition = B [OK]

Quick Trick: Use two block params for hash reject: |key, value| [OK]

Common Mistakes:

Using only one block parameter for hash reject
Checking key instead of value
Confusing reject with select for filtering

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More Ruby Quizzes

Given a hash scores = { alice: 90, bob: 55, carol: 75, dave: 40 }, how can you use reject to create a new hash excluding all entries with scores below 60?

Step 1: Understand hash reject block parameters

Step 2: Apply condition on values

Step 3: Verify options

Final Answer:

Quick Check:

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