You want to create a Ruby method that returns all numbers from 1 up to but not including a given number n. Which range operator should you use inside the method to achieve this?

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Ruby - Operators and Expressions

You want to create a Ruby method that returns all numbers from 1 up to but not including a given number n. Which range operator should you use inside the method to achieve this?

AUse <code>1...n</code> to exclude <code>n</code>

BUse <code>1...n-1</code> to exclude <code>n</code> and <code>n-1</code>

CUse <code>1...(n+1)</code> to exclude <code>n</code>

DUse <code>1..n</code> to include <code>n</code>

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
The method should return numbers from 1 up to but not including n.
Step 2: Choose the correct range operator
Using 1...n creates a range that excludes n, exactly what is needed.
Step 3: Evaluate other options
1..n includes n, 1...(n+1) includes n, 1...n-1 excludes n-1 too, which is incorrect.
Final Answer:
Use 1...n to exclude n -> Option A
Quick Check:
Three dots exclude the end value [OK]

Quick Trick: Use three dots to exclude the upper limit without math [OK]

Common Mistakes:

MISTAKES

Using two dots and including the end value
Subtracting 1 manually instead of using three dots
Misplacing parentheses causing wrong range
Using three dots with arithmetic causing off-by-one

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You want to create a Ruby method that returns all numbers from 1 up to but not including a given number n. Which range operator should you use inside the method to achieve this?

Step 1: Understand the requirement

Step 2: Choose the correct range operator

Step 3: Evaluate other options

Final Answer:

Quick Check:

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