Which of these is a correct way to use inject to sum all elements in an array nums?

easy📝 Conceptual Q2 of 15

Ruby - Enumerable and Collection Processing

Which of these is a correct way to use inject to sum all elements in an array nums?

Anums.inject(1) { |sum, n| sum - n }

Bnums.inject(0) { |sum, n| sum + n }

Cnums.inject { |sum, n| sum * n }

Dnums.inject { |sum, n| sum / n }

Step-by-Step Solution

Solution:

Step 1: Identify the correct initial value and operation
To sum elements, start with 0 and add each element to the accumulator.
Step 2: Check each option's operation
nums.inject(0) { |sum, n| sum + n } adds elements starting at 0, which correctly sums. Others multiply, subtract, or divide, which are incorrect for summing.
Final Answer:
nums.inject(0) { |sum, n| sum + n } -> Option B
Quick Check:
Sum with inject = start 0 + each element [OK]

Quick Trick: Start sum with 0 and add each element in block [OK]

Common Mistakes:

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