Which of these is a valid use of an until loop in Ruby?

easy📝 Conceptual Q2 of 15

Ruby - Loops and Iteration

Which of these is a valid use of an until loop in Ruby?

Auntil x != 10 do puts x x += 1 end

Buntil x < 10 do puts x x += 1 end

Cuntil x > 10 do puts x x -= 1 end

Duntil x == 10 do puts x x += 1 end

Step-by-Step Solution

Solution:

Step 1: Check condition logic for each option
until x == 10 do puts x x += 1 end runs until x equals 10, incrementing x each time, which is valid.
Step 2: Identify invalid conditions
until x < 10 do puts x x += 1 end runs until x is less than 10, but if x starts less than 10, loop never runs. until x > 10 do puts x x -= 1 end decrements x but condition is x > 10, which may cause infinite loop. until x != 10 do puts x x += 1 end increments x until x is not 10, which may cause infinite loop if x starts at 10.
Final Answer:
until x == 10 do puts x x += 1 end -> Option D
Quick Check:
Valid until loop condition = A [OK]

Quick Trick: Until loops run until condition becomes true [OK]

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