nuB has irb problems

[dave]

can't find the correct standalone comparator object for not
equals....in irb
g='give'
g.>('a') >>true
g.<('h') >>true
g.==('give') >>true
.....how does one DO not equals because g.<>('able') >>irb error OR
g.!=('able') >>irb error

.....also do not understand why:
at_hotel=true
if at_hotel puts 'hi' end >>> gives a irb syntax error
....BUT.....
if at_hotel
puts 'hi'
end >>>is oka in irb????

 

[Premshree]

g.!=('able') >>irb error

irb(main):004:0> g!="h"
=> true

....also do not understand why:
at_hotel=true
if at_hotel puts 'hi' end >>> gives a irb syntax error

if at_hotel; puts 'hi'; end

Premshree

 

[Ross Bamford]

can't find the correct standalone comparator object for not
equals....in irb
g='give'
g.>('a') >>true
g.<('h') >>true
g.==('give') >>true
....how does one DO not equals because g.<>('able') >>irb error OR
g.!=('able') >>irb error

....also do not understand why:
at_hotel=true
if at_hotel puts 'hi' end >>> gives a irb syntax error
...BUT.....
if at_hotel
puts 'hi'
end >>>is oka in irb????

# Don't use dots, especially not for != which isn't even a method

g = 'give'
# => "give"

if g != 'able' then "Not equal" end
# => "Not equal"

# Alternatively, if can be used as a statement modifier ...

"Not equal" if g != 'able'
# => "Not equal"

"Not equal" unless g == 'able'
# => "Not equal"

 

[dave]

I am SUPRISED... that all of the other comparators are messages and CAN
have the dot prefixed to an OBJECT BUT the not equals as in OBJECT.#=

 

[Martin DeMello]

I am SUPRISED... that all of the other comparators are messages and CAN
have the dot prefixed to an OBJECT BUT the not equals as in OBJECT.#=

Note that this keeps == and != consistent - != is simply the boolean
negation of ==. Otherwise you could define them so that they are both
true or false simultaneously.

martin