Methods and hints on the go

Question 1

how to check x is an integer?

Answer 1

x.is_a? Integer

Question 2

how to add elements to an array?

Answer 2

my_array.push(“element”)
or
my_array

Question 3

apply a block on each element of an array

Answer 3

my_array.collect { |x| x *2 }

Question 4

apply a block on each element of an array that meets a condition

Answer 4

my_array.select { |x| x % 2 == 0 }

Question 5

apply a block on each element of an array that does not meet a condition

Answer 5

my_array.reject { |x| x > 2 }