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beginner
Problem 01 • Step 02
Flat Addition
Now you’ll handle combinations like [2, "+", 3].
This kind of expression has two parts, a left side and a right side, joined by a +. If both sides are already numbers, the result of evaluation is their sum.
Your task is to tell the evaluator what the result should be when the input is a combination of two numbers with +.
Write your code inside the "l + r" rule, remove the text null // Replace null with correct expression and write your expression.