Which of the following is a valid way to create a lambda in Ruby?

easy📝 Conceptual Q2 of 15

Ruby - Blocks, Procs, and Lambdas

Amy_lambda = ->(x) { x * 2 }

Bmy_lambda = proc { |x| x * 2 }

Cmy_lambda = function(x) { x * 2 }

Dmy_lambda = lambda { |x| x * 2 }

Step-by-Step Solution

Solution:

Step 1: Identify valid lambda syntax
In Ruby, lambdas can be created using lambda { |args| ... } or the arrow syntax -> my_lambda = ->(x) { x * 2 }
Step 2: Check each option
my_lambda = lambda { |x| x * 2 } uses lambda with block and arguments correctly. my_lambda = proc { |x| x * 2 } creates a proc, not a lambda. my_lambda = function(x) { x * 2 } uses invalid Ruby syntax. my_lambda = ->(x) { x * 2 } uses correct arrow lambda syntax with parentheses.
Final Answer:
my_lambda = lambda { |x| x * 2 } and my_lambda = ->(x) { x * 2 } are valid lambda definitions.
Quick Check:
Valid lambda syntax = A and D [OK]

Quick Trick: Use lambda { |args| ... } or ->(args) { ... } [OK]

Common Mistakes:

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