What is the main difference between procs and lambdas?

The main difference between procs and lambdas in Ruby lies in how they handle return statements and argument checking.

Return Behavior

Lambdas in Ruby behave similarly to regular methods when it comes to return statements. Specifically, a return statement within a lambda will exit from the lambda itself and return control back to the calling method. This allows the rest of the code following the lambda call within the method to continue executing normally[1][2][4].

On the other hand, procs handle return statements differently. If a return statement is executed within a proc, it attempts to return from the method enclosing the proc. This can lead to unexpected behavior if the proc is not called within a method, as it will cause a LocalJumpError because there is no enclosing method context to return from[1][2][4].

Argument Checking

Another significant difference between procs and lambdas is how they check the arguments passed to them. Lambdas are strict about the number of arguments they accept. If the number of arguments passed to a lambda does not exactly match the number expected, it will raise an ArgumentError. This strictness makes lambdas behave more like regula...