Ruby about flip-flop understand the last point of attention

(1..  -  do |x|  if 5) end   

The use of the above flip-flop, you can be understood to be greater than or equal to 5 and less than or equal to 10 of the number printed out, that is understood as puts X if x >=5 && x <=10, but note you can not be written as follows

(1..  -  do |x|  if 5) end   

If the code is written as a green background, it will cause the output to be greater than or equal to 5 or less than or equal to 20

Question 2 usage of flip-flop

Puts x if (x = = 5): (x = = Ten)

Not equivalent to puts X if x >=5 && x <=10 on normal judging conditions

def Test (a)     if 5 Ten endtest (6)

The above code does not print out 6

def Test (a)     if 5 Ten endtest (+) #不输出test (5) #输出5test (8) #不输出

But you pass in 5 and you can print out 5, but the other one doesn't print.

If you change to the following

def Test (a)     if 5 Ten endtest (6)

is to print out 6 of the

Summary: Flip-flop usage is only within a block using rang, equivalent to >= && <= understanding

Ruby about flip-flop understand the last point of attention