Difference between #take_while and #select

Question

What is the difference between #take_while and #select

Don't both methods do the same thing?

p [1,2,3,4].take_while { |e| e < 3 } # prints [1,2]
p [1,2,3,4].select     { |e| e < 3 } # prints [1,2]

Answer 1

There is a difference, take_while stops from the moment the evaluation in the block is false, select will continue and evaluate everything.

[1,2,3,4,1].take_while{ |e| e < 3 } # prints [1,2]
[1,2,3,4,1].select{ |e| e < 3 } # prints [1,2,1]